defer rebuilding the white box mesh by a frame to prevent reentrancy causing issues

Gems/WhiteBox/Code/Source/Asset/EditorWhiteBoxMeshAsset.cpp

@@ -181,6 +181,9 @@ namespace WhiteBox
         // disconnect from any previously connected asset id
         AZ::Data::AssetBus::Handler::BusDisconnect();
         WhiteBoxMeshAssetNotificationBus::Handler::BusDisconnect();
+
+        // ensure we're disconnected from the tick bus
+        AZ::TickBus::Handler::BusDisconnect();
     }
 
     void EditorWhiteBoxMeshAsset::Release()
@@ -215,11 +218,20 @@ namespace WhiteBox
         if (asset == m_meshAsset)
         {
             m_meshAsset = asset;
-            EditorWhiteBoxComponentRequestBus::Event(
-                m_entityComponentIdPair, &EditorWhiteBoxComponentRequestBus::Events::RebuildWhiteBox);
+
+            // defer rebuilding the mesh by a frame by connecting to the tick bus - this prevents issues
+            // with reentrancy when rebuilding the white box mesh
+            AZ::TickBus::Handler::BusConnect();
         }
     }
 
+    void EditorWhiteBoxMeshAsset::OnTick([[maybe_unused]] float deltaTime, [[maybe_unused]] AZ::ScriptTimePoint time)
+    {
+        // after rebuilding the white box mesh, immediately disconnect from the tick bus (we only use it for deferred rebuilding)
+        EditorWhiteBoxComponentRequestBus::Event(m_entityComponentIdPair, &EditorWhiteBoxComponentRequestBus::Events::RebuildWhiteBox);
+        AZ::TickBus::Handler::BusDisconnect();
+    }
+
     void EditorWhiteBoxMeshAsset::OnAssetReloaded(AZ::Data::Asset<AZ::Data::AssetData> asset)
     {
         OnAssetReady(asset);