Finish up Web.Backoffice

src/Umbraco.Core/Models/ContentEditing/ContentBaseSave.cs

@@ -36,7 +36,7 @@ namespace Umbraco.Cms.Core.Models.ContentEditing
         //These need explicit implementation because we are using internal models
         /// <inheritdoc />
         [IgnoreDataMember]
-        TPersisted? IContentSave<TPersisted>.PersistedContent { get; set; }
+        TPersisted IContentSave<TPersisted>.PersistedContent { get; set; }
 
         //Non explicit internal getter so we don't need to explicitly cast in our own code
         [IgnoreDataMember]

src/Umbraco.Core/Models/ContentEditing/ContentItemSave.cs

@@ -50,11 +50,11 @@ namespace Umbraco.Cms.Core.Models.ContentEditing
         //These need explicit implementation because we are using internal models
         /// <inheritdoc />
         [IgnoreDataMember]
-        IContent? IContentSave<IContent>.PersistedContent { get; set; }
+        IContent IContentSave<IContent>.PersistedContent { get; set; }
 
         //Non explicit internal getter so we don't need to explicitly cast in our own code
         [IgnoreDataMember]
-        public IContent? PersistedContent
+        public IContent PersistedContent
         {
             get => ((IContentSave<IContent>)this).PersistedContent;
             set => ((IContentSave<IContent>)this).PersistedContent = value;

src/Umbraco.Core/Models/ContentEditing/IContentSave.cs

@@ -18,6 +18,6 @@
         /// <remarks>
         /// This is not used for outgoing model information.
         /// </remarks>
-        TPersisted? PersistedContent { get; set; }
+        TPersisted PersistedContent { get; set; }
     }
 }