fix issue #30529

src/Workspaces/CSharp/Portable/Formatting/CSharpFormattingOptions.Parsers.cs

@@ -80,9 +80,16 @@ internal static bool DetermineIfNewLineOptionIsSet(string value, NewLineOption o
         }
 
         private static NewLineOption? ConvertToNewLineOption(string value)
-            => s_newLineOptionsEditorConfigMap.TryGetValue(value, out var option)
-               ? option
-               : (NewLineOption?)null;
+        { 
+            if (s_newLineOptionsEditorConfigMap.TryGetValue(value, out var option)) {
+                return option;
+            }
+            if (s_legacyNewLineOptionsEditorConfigMap.TryGetValue(value, out var legacyOption))
+            {
+                return legacyOption;
+            }
+            return null;
+        }
 
         private static string GetNewLineOptionEditorConfigString(OptionSet optionSet)
         {

src/Workspaces/CSharp/Portable/Formatting/CSharpFormattingOptions.cs

@@ -40,6 +40,11 @@ public static partial class CSharpFormattingOptions
                 KeyValuePairUtil.Create("no_change", LabelPositionOptions.NoIndent),
                 KeyValuePairUtil.Create("one_less_than_current", LabelPositionOptions.OneLess),
             });
+        private static readonly BidirectionalMap<string, NewLineOption> s_legacyNewLineOptionsEditorConfigMap =
+            new BidirectionalMap<string, NewLineOption>(new[]
+            {
+                KeyValuePairUtil.Create("object_collection_array_initalizers", NewLineOption.ObjectCollectionsArrayInitializers),
+            });
         private static readonly BidirectionalMap<string, NewLineOption> s_newLineOptionsEditorConfigMap =
             new BidirectionalMap<string, NewLineOption>(new[]
             {
@@ -52,7 +57,7 @@ public static partial class CSharpFormattingOptions
                 KeyValuePairUtil.Create("anonymous_methods", NewLineOption.AnonymousMethods),
                 KeyValuePairUtil.Create("control_blocks", NewLineOption.ControlBlocks),
                 KeyValuePairUtil.Create("anonymous_types", NewLineOption.AnonymousTypes),
-                KeyValuePairUtil.Create("object_collection_array_initalizers", NewLineOption.ObjectCollectionsArrayInitializers),
+                KeyValuePairUtil.Create("object_collection_array_initializers", NewLineOption.ObjectCollectionsArrayInitializers),
                 KeyValuePairUtil.Create("lambdas", NewLineOption.Lambdas),
                 KeyValuePairUtil.Create("local_functions", NewLineOption.LocalFunction),
             });

src/Workspaces/CSharpTest/Formatting/EditorConfigOptionParserTests.cs

@@ -92,6 +92,7 @@ static void TestParseEditorConfigLabelPositioningFalse(string value)
         InlineData("control_blocks", NewLineOption.ControlBlocks),
         InlineData("anonymous_types", NewLineOption.AnonymousTypes),
         InlineData("object_collection_array_initalizers", NewLineOption.ObjectCollectionsArrayInitializers),
+        InlineData("object_collection_array_initializers", NewLineOption.ObjectCollectionsArrayInitializers),
         InlineData("lambdas", NewLineOption.Lambdas),
         InlineData("local_functions", NewLineOption.LocalFunction)]
         static void TestParseNewLineOptionTrue(string value, NewLineOption option)