To prevent issues of combining Nested Content with Block Editors, plus nudging Devs to use Block List instead, we now prevent the usage of NC in BL.

src/Umbraco.Web.UI.Client/src/common/services/blockeditormodelobject.service.js

@@ -231,7 +231,8 @@
         var notSupportedProperties = [
             "Umbraco.Tags",
             "Umbraco.UploadField",
-            "Umbraco.ImageCropper"
+            "Umbraco.ImageCropper",
+            "Umbraco.NestedContent"
         ];