diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 0288911f9e964d69d90ae36e938941cb3e27a5d6..c39e4f27f1bcb1fbf79569c0ae9d654023f7f0fa 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -3,9 +3,9 @@
   <ProductDependencies>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="5.0.0-beta.19602.4">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="5.0.0-beta.19603.17">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>9d34fd008e754e1ada35c8b6bc3694e7a90b4ed7</Sha>
+      <Sha>b902fd6b6948e689a5128fa6d94dc7de13e6af84</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>
diff --git a/eng/common/SetupNugetSources.ps1 b/eng/common/SetupNugetSources.ps1
index 6662e4bc1ece65de8196a7603ae71b6c487dde28..a5a1e711d79c67feda4ff9725ae7df54abf851da 100644
--- a/eng/common/SetupNugetSources.ps1
+++ b/eng/common/SetupNugetSources.ps1
@@ -16,7 +16,7 @@
 #    condition: eq(variables['Agent.OS'], 'Windows_NT')
 #    inputs:
 #      filePath: $(Build.SourcesDirectory)/eng/common/SetupNugetSources.ps1
-#      arguments: -ConfigFile ${Env:BUILD_SOURCESDIRECTORY}/NuGet.config -Password $Env:Token
+#      arguments: -ConfigFile $(Build.SourcesDirectory)/NuGet.config -Password $Env:Token
 #    env:
 #      Token: $(dn-bot-dnceng-artifact-feeds-rw)
 
@@ -94,41 +94,48 @@ function InsertMaestroPrivateFeedCredentials($Sources, $Creds, $Password) {
     }
 }
 
-try {
-    if (!(Test-Path $ConfigFile -PathType Leaf)) {
-    Write-PipelineTelemetryError -Category 'Build' -Message "Couldn't find the file NuGet config file: $ConfigFile"
+if (!(Test-Path $ConfigFile -PathType Leaf)) {
+  Write-PipelineTelemetryError -Category 'Build' -Message "Eng/common/SetupNugetSources.ps1 returned a non-zero exit code. Couldn't find the NuGet config file: $ConfigFile"
+  ExitWithExitCode 1
+}
+
+if (!$Password) {
+    Write-PipelineTelemetryError -Category 'Build' -Message 'Eng/common/SetupNugetSources.ps1 returned a non-zero exit code. Please supply a valid PAT'
     ExitWithExitCode 1
-    }
+}
 
-    # Load NuGet.config
-    $doc = New-Object System.Xml.XmlDocument
-    $filename = (Get-Item $ConfigFile).FullName
-    $doc.Load($filename)
+# Load NuGet.config
+$doc = New-Object System.Xml.XmlDocument
+$filename = (Get-Item $ConfigFile).FullName
+$doc.Load($filename)
 
-    # Get reference to <PackageSources> or create one if none exist already
-    $sources = $doc.DocumentElement.SelectSingleNode("packageSources")
-    if ($sources -eq $null) {
-        $sources = $doc.CreateElement("packageSources")
-        $doc.DocumentElement.AppendChild($sources) | Out-Null
-    }
+# Get reference to <PackageSources> or create one if none exist already
+$sources = $doc.DocumentElement.SelectSingleNode("packageSources")
+if ($sources -eq $null) {
+    $sources = $doc.CreateElement("packageSources")
+    $doc.DocumentElement.AppendChild($sources) | Out-Null
+}
 
-    # Looks for a <PackageSourceCredentials> node. Create it if none is found.
-    $creds = $doc.DocumentElement.SelectSingleNode("packageSourceCredentials")
-    if ($creds -eq $null) {
-        $creds = $doc.CreateElement("packageSourceCredentials")
-        $doc.DocumentElement.AppendChild($creds) | Out-Null
-    }
+# Looks for a <PackageSourceCredentials> node. Create it if none is found.
+$creds = $doc.DocumentElement.SelectSingleNode("packageSourceCredentials")
+if ($creds -eq $null) {
+    $creds = $doc.CreateElement("packageSourceCredentials")
+    $doc.DocumentElement.AppendChild($creds) | Out-Null
+}
 
-    # Insert credential nodes for Maestro's private feeds
-    InsertMaestroPrivateFeedCredentials -Sources $sources -Creds $creds -Password $Password
+# Insert credential nodes for Maestro's private feeds
+InsertMaestroPrivateFeedCredentials -Sources $sources -Creds $creds -Password $Password
 
+$dotnet3Source = $sources.SelectSingleNode("add[@key='dotnet3']")
+if ($dotnet3Source -ne $null) {
     AddPackageSource -Sources $sources -SourceName "dotnet3-internal" -SourceEndPoint "https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3-internal/nuget/v2" -Creds $creds -Username "dn-bot" -Password $Password
     AddPackageSource -Sources $sources -SourceName "dotnet3-internal-transport" -SourceEndPoint "https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3-internal-transport/nuget/v2" -Creds $creds -Username "dn-bot" -Password $Password
-
-    $doc.Save($filename)
 }
-catch {
-    Write-Host $_.ScriptStackTrace
-    Write-PipelineTelemetryError -Category 'InitializeToolset' -Message $_
-    ExitWithExitCode 1
+
+$dotnet31Source = $sources.SelectSingleNode("add[@key='dotnet3.1']")
+if ($dotnet31Source -ne $null) {
+    AddPackageSource -Sources $sources -SourceName "dotnet3.1-internal" -SourceEndPoint "https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3.1-internal/nuget/v2" -Creds $creds -Username "dn-bot" -Password $Password
+    AddPackageSource -Sources $sources -SourceName "dotnet3.1-internal-transport" -SourceEndPoint "https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3.1-internal-transport/nuget/v2" -Creds $creds -Username "dn-bot" -Password $Password
 }
+
+$doc.Save($filename)
diff --git a/eng/common/SetupNugetSources.sh b/eng/common/SetupNugetSources.sh
index 55ad70e3663161702265b03025131fcd9fc664f7..7d6fef27fe495e2c3470b81c9d872e8f470f6c42 100644
--- a/eng/common/SetupNugetSources.sh
+++ b/eng/common/SetupNugetSources.sh
@@ -17,7 +17,7 @@
 #    displayName: Setup Private Feeds Credentials
 #    inputs:
 #      filePath: $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh
-#      arguments: $BUILD_SOURCESDIRECTORY/NuGet.config $Token
+#      arguments: $(Build.SourcesDirectory)/NuGet.config $Token
 #    condition: ne(variables['Agent.OS'], 'Windows_NT')
 #    env:
 #      Token: $(dn-bot-dnceng-artifact-feeds-rw)
@@ -42,7 +42,12 @@ scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
 . "$scriptroot/tools.sh"
 
 if [ ! -f "$ConfigFile" ]; then
-    Write-PipelineTelemetryError -Category 'Build' -Message "Couldn't find the file NuGet config file: $ConfigFile"
+    Write-PipelineTelemetryError -Category 'Build' "Error: Eng/common/SetupNugetSources.sh returned a non-zero exit code. Couldn't find the NuGet config file: $ConfigFile"
+    ExitWithExitCode 1
+fi
+
+if [ -z "$CredToken" ]; then
+    Write-PipelineTelemetryError -category 'Build' "Error: Eng/common/SetupNugetSources.sh returned a non-zero exit code. Please supply a valid PAT"
     ExitWithExitCode 1
 fi
 
@@ -52,7 +57,7 @@ if [[ `uname -s` == "Darwin" ]]; then
 fi
 
 # Ensure there is a <packageSources>...</packageSources> section.
-grep -i "<packageSources>" $ConfigFile 
+grep -i "<packageSources>" $ConfigFile
 if [ "$?" != "0" ]; then
     echo "Adding <packageSources>...</packageSources> section."
     ConfigNodeHeader="<configuration>"
@@ -62,7 +67,7 @@ if [ "$?" != "0" ]; then
 fi
 
 # Ensure there is a <packageSourceCredentials>...</packageSourceCredentials> section. 
-grep -i "<packageSourceCredentials>" $ConfigFile 
+grep -i "<packageSourceCredentials>" $ConfigFile
 if [ "$?" != "0" ]; then
     echo "Adding <packageSourceCredentials>...</packageSourceCredentials> section."
 
@@ -72,37 +77,64 @@ if [ "$?" != "0" ]; then
     sed -i.bak "s|$PackageSourcesNodeFooter|$PackageSourcesNodeFooter${NL}$PackageSourceCredentialsTemplate|" NuGet.config
 fi
 
-# Ensure dotnet3-internal and dotnet3-internal-transport is in the packageSources
-grep -i "<add key=\"dotnet3-internal\">" $ConfigFile 
-if [ "$?" != "0" ]; then
-    echo "Adding dotnet3-internal to the packageSources."
+PackageSources=()
 
-    PackageSourcesNodeFooter="</packageSources>"
-    PackageSourceTemplate="${TB}<add key=\"dotnet3-internal\" value=\"https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3-internal/nuget/v2\" />"
+# Ensure dotnet3-internal and dotnet3-internal-transport are in the packageSources if the public dotnet3 feeds are present
+grep -i "<add key=\"dotnet3\"" $ConfigFile
+
+if [ "$?" == "0" ]; then
+    grep -i "<add key=\"dotnet3-internal\">" $ConfigFile
+    if [ "$?" != "0" ]; then
+        echo "Adding dotnet3-internal to the packageSources."
+        PackageSourcesNodeFooter="</packageSources>"
+        PackageSourceTemplate="${TB}<add key=\"dotnet3-internal\" value=\"https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3-internal/nuget/v2\" />"
+
+        sed -i.bak "s|$PackageSourcesNodeFooter|$PackageSourceTemplate${NL}$PackageSourcesNodeFooter|" $ConfigFile
+    fi
+    PackageSources+=('dotnet3-internal')
+
+    grep -i "<add key=\"dotnet3-internal-transport\"" $ConfigFile
+    if [ "$?" != "0" ]; then
+        echo "Adding dotnet3-internal-transport to the packageSources."
+        PackageSourcesNodeFooter="</packageSources>"
+        PackageSourceTemplate="${TB}<add key=\"dotnet3-internal-transport\" value=\"https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3-internal-transport/nuget/v2\" />"
 
-    sed -i.bak "s|$PackageSourcesNodeFooter|$PackageSourceTemplate${NL}$PackageSourcesNodeFooter|" NuGet.config
+        sed -i.bak "s|$PackageSourcesNodeFooter|$PackageSourceTemplate${NL}$PackageSourcesNodeFooter|" $ConfigFile
+    fi
+    PackageSources+=('dotnet3-internal-transport')
 fi
 
-# Ensure dotnet3-internal and dotnet3-internal-transport is in the packageSources
-grep -i "<add key=\"dotnet3-internal-transport\">" $ConfigFile 
-if [ "$?" != "0" ]; then
-    echo "Adding dotnet3-internal-transport to the packageSources."
+# Ensure dotnet3.1-internal and dotnet3.1-internal-transport are in the packageSources if the public dotnet3.1 feeds are present
+grep -i "<add key=\"dotnet3.1\"" $ConfigFile
+if [ "$?" == "0" ]; then
+    grep -i "<add key=\"dotnet3.1-internal\"" $ConfigFile
+    if [ "$?" != "0" ]; then
+        echo "Adding dotnet3.1-internal to the packageSources."
+        PackageSourcesNodeFooter="</packageSources>"
+        PackageSourceTemplate="${TB}<add key=\"dotnet3.1-internal\" value=\"https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3.1-internal/nuget/v2\" />"
 
-    PackageSourcesNodeFooter="</packageSources>"
-    PackageSourceTemplate="${TB}<add key=\"dotnet3-internal-transport\" value=\"https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3-internal-transport/nuget/v2\" />"
+        sed -i.bak "s|$PackageSourcesNodeFooter|$PackageSourceTemplate${NL}$PackageSourcesNodeFooter|" $ConfigFile
+    fi
+    PackageSources+=('dotnet3.1-internal')
+
+    grep -i "<add key=\"dotnet3.1-internal-transport\">" $ConfigFile
+    if [ "$?" != "0" ]; then
+        echo "Adding dotnet3.1-internal-transport to the packageSources."
+        PackageSourcesNodeFooter="</packageSources>"
+        PackageSourceTemplate="${TB}<add key=\"dotnet3.1-internal-transport\" value=\"https://pkgs.dev.azure.com/dnceng/_packaging/dotnet3.1-internal-transport/nuget/v2\" />"
 
-    sed -i.bak "s|$PackageSourcesNodeFooter|$PackageSourceTemplate${NL}$PackageSourcesNodeFooter|" NuGet.config
+        sed -i.bak "s|$PackageSourcesNodeFooter|$PackageSourceTemplate${NL}$PackageSourcesNodeFooter|" $ConfigFile
+    fi
+    PackageSources+=('dotnet3.1-internal-transport')
 fi
 
 # I want things split line by line
 PrevIFS=$IFS
 IFS=$'\n'
-PackageSources=$(grep -oh '"darc-int-[^"]*"' $ConfigFile | tr -d '"')
+PackageSources+="$IFS"
+PackageSources+=$(grep -oh '"darc-int-[^"]*"' $ConfigFile | tr -d '"')
 IFS=$PrevIFS
 
-PackageSources+=('dotnet3-internal')
-PackageSources+=('dotnet3-internal-transport')
-
 for FeedName in ${PackageSources[@]} ; do
     # Check if there is no existing credential for this FeedName
     grep -i "<$FeedName>" $ConfigFile 
@@ -112,6 +144,6 @@ for FeedName in ${PackageSources[@]} ; do
         PackageSourceCredentialsNodeFooter="</packageSourceCredentials>"
         NewCredential="${TB}${TB}<$FeedName>${NL}<add key=\"Username\" value=\"dn-bot\" />${NL}<add key=\"ClearTextPassword\" value=\"$CredToken\" />${NL}</$FeedName>"
 
-        sed -i.bak "s|$PackageSourceCredentialsNodeFooter|$NewCredential${NL}$PackageSourceCredentialsNodeFooter|" NuGet.config
+        sed -i.bak "s|$PackageSourceCredentialsNodeFooter|$NewCredential${NL}$PackageSourceCredentialsNodeFooter|" $ConfigFile
     fi
 done
diff --git a/eng/common/build.ps1 b/eng/common/build.ps1
index 0fd4d9c7f231655e048fa05b6d54116c618a9273..88814514d828b96adc8a82f9bf271fba80b95e76 100644
--- a/eng/common/build.ps1
+++ b/eng/common/build.ps1
@@ -62,6 +62,8 @@ function Print-Usage() {
   Write-Host "The above arguments can be shortened as much as to be unambiguous (e.g. -co for configuration, -t for test, etc.)."
 }
 
+. $PSScriptRoot\tools.ps1
+
 function InitializeCustomToolset {
   if (-not $restore) {
     return
@@ -113,8 +115,6 @@ function Build {
 }
 
 try {
-  . $PSScriptRoot\tools.ps1
-  
   if ($clean) {
     if (Test-Path $ArtifactsDir) {
       Remove-Item -Recurse -Force $ArtifactsDir
@@ -122,12 +122,7 @@ try {
     }
     exit 0
   }
-  
-  if ((Test-Path variable:LastExitCode) -And ($LastExitCode -ne 0)) {
-    Write-PipelineTelemetryError -Category 'InitializeToolset' -Message 'Eng/common/tools.ps1 returned a non-zero exit code.'
-    ExitWithExitCode $LastExitCode
-  }
-  
+
   if ($help -or (($null -ne $properties) -and ($properties.Contains('/help') -or $properties.Contains('/?')))) {
     Print-Usage
     exit 0
diff --git a/eng/common/init-tools-native.ps1 b/eng/common/init-tools-native.ps1
index f4409f0835acb2dd6edef9ba4cc88f44a4c0b81b..db830c00a6f8d895705454c3507171b2f0f94705 100644
--- a/eng/common/init-tools-native.ps1
+++ b/eng/common/init-tools-native.ps1
@@ -113,14 +113,16 @@ try {
             }
             $toolInstallationFailure = $true
         } else {
-            Write-PipelineTelemetryError -Category 'NativeToolsBootstrap' -Message $errMsg
+            # We cannot change this to Write-PipelineTelemetryError because of https://github.com/dotnet/arcade/issues/4482
+            Write-Host $errMsg
             exit 1
         }
       }
     }
 
     if ((Get-Variable 'toolInstallationFailure' -ErrorAction 'SilentlyContinue') -and $toolInstallationFailure) {
-        Write-PipelineTelemetryError -Category 'NativeToolsBootstrap' -Message 'Native tools bootstrap failed'
+        # We cannot change this to Write-PipelineTelemetryError because of https://github.com/dotnet/arcade/issues/4482
+        Write-Host 'Native tools bootstrap failed'
         exit 1
     }
   }
diff --git a/eng/common/native/install-tool.ps1 b/eng/common/native/install-tool.ps1
index ca180d03ba189ea72e8af0f2a10562cfe5c68660..f397e1c75d411eaa405647641acdb0f75fd4b1d1 100644
--- a/eng/common/native/install-tool.ps1
+++ b/eng/common/native/install-tool.ps1
@@ -105,7 +105,7 @@ try {
     Write-Error "There are multiple copies of $ToolName in $($ToolInstallDirectory): `n$(@($ToolFilePath | out-string))"
     exit 1
   } elseif (@($ToolFilePath).Length -Lt 1) {
-    Write-Error "$ToolName was not found in $ToolFilePath."
+    Write-Host "$ToolName was not found in $ToolFilePath."
     exit 1
   }
 
diff --git a/eng/common/pipeline-logging-functions.ps1 b/eng/common/pipeline-logging-functions.ps1
index e0656185886fbcaac183ef55ac6e20a2bc3f6e3d..2688c389bd96693d5b2059cee2ff34cda2f9ebb8 100644
--- a/eng/common/pipeline-logging-functions.ps1
+++ b/eng/common/pipeline-logging-functions.ps1
@@ -85,7 +85,7 @@ function Write-PipelineTaskError {
       [switch]$AsOutput,
       [bool]$IsMultiJobVariable=$true)
 
-      if(-Not (Test-Path variable:ci) -Or !$ci) {
+      if((Test-Path variable:ci) -And $ci) {
         Write-LoggingCommand -Area 'task' -Event 'setvariable' -Data $Value -Properties @{
           'variable' = $Name
           'isSecret' = $Secret
diff --git a/global.json b/global.json
index 5820271a032f54aebe8ac7bbfb0bfcf8b7ec60de..25b5c5b2dd3a9229e71f9226204eb34f6ffb96a0 100644
--- a/global.json
+++ b/global.json
@@ -7,6 +7,6 @@
     "xcopy-msbuild": "16.3.0-alpha"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "5.0.0-beta.19602.4"
+    "Microsoft.DotNet.Arcade.Sdk": "5.0.0-beta.19603.17"
   }
 }
diff --git a/src/Compilers/CSharp/Portable/Binder/Binder_Operators.cs b/src/Compilers/CSharp/Portable/Binder/Binder_Operators.cs
index 7319f4c701be6fff25f1a426eb96b844d8fbfa94..aafdce6837720aaca3f08c257f7dc392740c60ff 100644
--- a/src/Compilers/CSharp/Portable/Binder/Binder_Operators.cs
+++ b/src/Compilers/CSharp/Portable/Binder/Binder_Operators.cs
@@ -78,6 +78,8 @@ private BoundExpression BindCompoundAssignment(AssignmentExpressionSyntax node,
                     Error(diagnostics, ErrorCode.ERR_BadBinaryOps, node, node.OperatorToken.Text, left.Display, right.Display);
 
                     // error: operator can't be applied on dynamic and a type that is not convertible to dynamic:
+                    left = BindToTypeForErrorRecovery(left);
+                    right = BindToTypeForErrorRecovery(right);
                     return new BoundCompoundAssignmentOperator(node, BinaryOperatorSignature.Error, left, right,
                         Conversion.NoConversion, Conversion.NoConversion, LookupResultKind.Empty, CreateErrorType(), hasErrors: true);
                 }
@@ -90,6 +92,8 @@ private BoundExpression BindCompoundAssignment(AssignmentExpressionSyntax node,
                 // be used here.
 
                 // NOTE: no overload resolution candidates.
+                left = BindToTypeForErrorRecovery(left);
+                right = BindToTypeForErrorRecovery(right);
                 return new BoundCompoundAssignmentOperator(node, BinaryOperatorSignature.Error, left, right,
                     Conversion.NoConversion, Conversion.NoConversion, LookupResultKind.NotAVariable, CreateErrorType(), hasErrors: true);
             }
diff --git a/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs b/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
index 986369928f2a747dbccdc3a8c7551c2bd2362864..b7bc03906ad07b2079fae1333c52e9ae2ca040e4 100644
--- a/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
+++ b/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
@@ -1865,14 +1865,14 @@ public override BoundNode VisitObjectCreationExpression(BoundObjectCreationExpre
 
             if (initializerOpt != null)
             {
-                VisitObjectCreationInitializer(null, slot, initializerOpt);
+                VisitObjectCreationInitializer(containingSymbol: null, slot, initializerOpt, leftAnnotations: FlowAnalysisAnnotations.None);
             }
 
             SetResultType(node, TypeWithState.Create(type, resultState));
         }
 #nullable restore
 
-        private void VisitObjectCreationInitializer(Symbol containingSymbol, int containingSlot, BoundExpression node)
+        private void VisitObjectCreationInitializer(Symbol containingSymbol, int containingSlot, BoundExpression node, FlowAnalysisAnnotations leftAnnotations)
         {
             TakeIncrementalSnapshot(node);
             switch (node)
@@ -1913,7 +1913,7 @@ private void VisitObjectCreationInitializer(Symbol containingSymbol, int contain
                     Debug.Assert((object)containingSymbol != null);
                     if ((object)containingSymbol != null)
                     {
-                        var type = containingSymbol.GetTypeOrReturnType();
+                        var type = ApplyLValueAnnotations(containingSymbol.GetTypeOrReturnType(), leftAnnotations);
                         TypeWithState resultType = VisitOptionalImplicitConversion(node, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment);
                         TrackNullableStateForAssignment(node, type, containingSlot, resultType, MakeSlot(node));
                     }
@@ -1951,7 +1951,7 @@ private void VisitObjectElementInitializer(int containingSlot, BoundAssignmentOp
                         if ((object)symbol != null)
                         {
                             int slot = (containingSlot < 0) ? -1 : GetOrCreateSlot(symbol, containingSlot);
-                            VisitObjectCreationInitializer(symbol, slot, node.Right);
+                            VisitObjectCreationInitializer(symbol, slot, node.Right, GetLValueAnnotations(node.Left));
                             // https://github.com/dotnet/roslyn/issues/35040: Should likely be setting _resultType in VisitObjectCreationInitializer
                             // and using that value instead of reconstructing here
                         }
@@ -6010,6 +6010,8 @@ private FlowAnalysisAnnotations GetLValueAnnotations(BoundExpression expr)
                 BoundPropertyAccess property => getSetterAnnotations(property.PropertySymbol),
                 BoundIndexerAccess indexer => getSetterAnnotations(indexer.Indexer),
                 BoundFieldAccess field => getFieldAnnotations(field.FieldSymbol),
+                BoundObjectInitializerMember { MemberSymbol: PropertySymbol prop } => getSetterAnnotations(prop),
+                BoundObjectInitializerMember { MemberSymbol: FieldSymbol field } => getFieldAnnotations(field),
                 _ => FlowAnalysisAnnotations.None
             };
 
diff --git a/src/Compilers/CSharp/Test/Semantic/Semantics/NullableReferenceTypesTests.cs b/src/Compilers/CSharp/Test/Semantic/Semantics/NullableReferenceTypesTests.cs
index 992912bcebffbeefbef999de5164662fccc66049..c5517c4488e286edbf16fae3a56e13d000338210 100644
--- a/src/Compilers/CSharp/Test/Semantic/Semantics/NullableReferenceTypesTests.cs
+++ b/src/Compilers/CSharp/Test/Semantic/Semantics/NullableReferenceTypesTests.cs
@@ -28032,6 +28032,132 @@ static void M(C c)
             comp.VerifyDiagnostics();
         }
 
+        [Fact, WorkItem(39966, "https://github.com/dotnet/roslyn/issues/39966")]
+        public void AllowNull_Property_InObjectInitializer()
+        {
+            var source = @"
+using System.Diagnostics.CodeAnalysis;
+public class C
+{
+    [AllowNull] public C P { get; set; } // 1
+}
+
+class Program
+{
+    static void M(C c1)
+    {
+        c1.P = null;
+
+        new C
+        {
+            P = null
+        };
+    }
+}";
+
+            var comp = CreateNullableCompilation(new[] { source, AllowNullAttributeDefinition });
+            comp.VerifyDiagnostics(
+                // (5,26): warning CS8618: Non-nullable property 'P' is uninitialized. Consider declaring the property as nullable.
+                //     [AllowNull] public C P { get; set; } // 1
+                Diagnostic(ErrorCode.WRN_UninitializedNonNullableField, "P").WithArguments("property", "P").WithLocation(5, 26));
+        }
+
+        [Fact, WorkItem(39966, "https://github.com/dotnet/roslyn/issues/39966")]
+        public void AllowNull_Field_InObjectInitializer()
+        {
+            var source = @"
+using System.Diagnostics.CodeAnalysis;
+public class C
+{
+    [AllowNull] public C F; // 1
+}
+
+class Program
+{
+    static void M(C c1)
+    {
+        c1.F = null;
+
+        new C
+        {
+            F = null
+        };
+    }
+}";
+
+            var comp = CreateNullableCompilation(new[] { source, AllowNullAttributeDefinition });
+            comp.VerifyDiagnostics(
+                // (5,26): warning CS8618: Non-nullable field 'F' is uninitialized. Consider declaring the field as nullable.
+                //     [AllowNull] public C F; // 1
+                Diagnostic(ErrorCode.WRN_UninitializedNonNullableField, "F").WithArguments("field", "F").WithLocation(5, 26));
+        }
+
+        [Fact, WorkItem(39966, "https://github.com/dotnet/roslyn/issues/39966")]
+        public void DisallowNull_Property_InObjectInitializer()
+        {
+            var source = @"
+using System.Diagnostics.CodeAnalysis;
+public class C
+{
+    [DisallowNull] public C? P { get; set; }
+}
+
+class Program
+{
+    static void M(C c1)
+    {
+        c1.P = null; // 1
+
+        new C
+        {
+            P = null // 2
+        };
+    }
+}";
+
+            var comp = CreateNullableCompilation(new[] { source, DisallowNullAttributeDefinition });
+            comp.VerifyDiagnostics(
+                // (12,16): warning CS8625: Cannot convert null literal to non-nullable reference type.
+                //         c1.P = null; // 1
+                Diagnostic(ErrorCode.WRN_NullAsNonNullable, "null").WithLocation(12, 16),
+                // (16,17): warning CS8625: Cannot convert null literal to non-nullable reference type.
+                //             P = null // 2
+                Diagnostic(ErrorCode.WRN_NullAsNonNullable, "null").WithLocation(16, 17));
+        }
+
+        [Fact, WorkItem(39966, "https://github.com/dotnet/roslyn/issues/39966")]
+        public void DisallowNull_Field_InObjectInitializer()
+        {
+            var source = @"
+using System.Diagnostics.CodeAnalysis;
+public class C
+{
+    [DisallowNull] public C? F;
+}
+
+class Program
+{
+    static void M(C c1)
+    {
+        c1.F = null; // 1
+
+        new C
+        {
+            F = null // 2
+        };
+    }
+}";
+
+            var comp = CreateNullableCompilation(new[] { source, DisallowNullAttributeDefinition });
+            comp.VerifyDiagnostics(
+                // (12,16): warning CS8625: Cannot convert null literal to non-nullable reference type.
+                //         c1.F = null; // 1
+                Diagnostic(ErrorCode.WRN_NullAsNonNullable, "null").WithLocation(12, 16),
+                // (16,17): warning CS8625: Cannot convert null literal to non-nullable reference type.
+                //             F = null // 2
+                Diagnostic(ErrorCode.WRN_NullAsNonNullable, "null").WithLocation(16, 17));
+        }
+
         [Fact]
         public void AllowNull_Property_InDeconstructionAssignment()
         {
diff --git a/src/Compilers/CSharp/Test/Semantic/Semantics/OperatorTests.cs b/src/Compilers/CSharp/Test/Semantic/Semantics/OperatorTests.cs
index 5551c717805fe881f7863ae20528fe2e84db012a..49e88344e3bdb774c273be27aee9ed73cd8be6b0 100644
--- a/src/Compilers/CSharp/Test/Semantic/Semantics/OperatorTests.cs
+++ b/src/Compilers/CSharp/Test/Semantic/Semantics/OperatorTests.cs
@@ -10904,5 +10904,24 @@ static void Main()
                 Diagnostic(ErrorCode.ERR_ConstantStringTooLong, "C1").WithLocation(28, 68)
                 );
         }
+
+        [Fact, WorkItem(39975, "https://github.com/dotnet/roslyn/issues/39975")]
+        public void EnsureOperandsConvertedInErrorExpression_01()
+        {
+            string source =
+@"class C
+{
+    static unsafe void M(dynamic d, int* p)
+    {
+        d += p;
+    }
+}
+";
+            CreateCompilation(source, options: TestOptions.ReleaseDll.WithAllowUnsafe(true)).VerifyDiagnostics(
+                // (5,9): error CS0019: Operator '+=' cannot be applied to operands of type 'dynamic' and 'int*'
+                //         d += p;
+                Diagnostic(ErrorCode.ERR_BadBinaryOps, "d += p").WithArguments("+=", "dynamic", "int*").WithLocation(5, 9)
+                );
+        }
     }
 }