* Open development branch to add support for the new prefab workflow.

Assets/NavMeshComponents/Scripts/NavMeshSurface.cs

@@ -373,7 +373,7 @@ bool UnshareNavMeshAsset()
                 return false;
 
             // An instance can share asset reference only with its prefab parent
-            var prefab = UnityEditor.PrefabUtility.GetPrefabParent(this) as NavMeshSurface;
+            var prefab = UnityEditor.PrefabUtility.GetCorrespondingObjectFromSource(this) as NavMeshSurface;
             if (prefab != null && prefab.navMeshData == navMeshData)
                 return false;
 

ProjectSettings/ProjectVersion.txt

-m_EditorVersion: 2018.1.0b1
+m_EditorVersion: 2018.2.0a8

README.md

-> This branch requires **Unity 2018.1**. For older or future versions of Unity please use a matching branch ([master](../..), [5.6](../../tree/5.6), [2017.1](../../tree/2017.1)).
+> ⚠️ The code in this branch is not fully compatible with any publicly-available Unity editor. It addresses changes in the prefab workflow.
 
 # Components for Runtime NavMesh Building