Blueprint reference bug [Demo included]

I’ve just did this and nothing changed, the warnings are still there. Maybe they’re ‘fake’ warnings (inaccurate ones)? Because there are few more warnings showing up at startup in Outpu Log even on every new, clear project (like “LogUObjectGlobals:Warning: Failed to find object ‘Class None.’” or “LogDirectoryWatcher:Warning: Failed to begin reading directory changes for …/…/…/Engine/Plugins/Experimental/CharacterAI/Content/. Error: 0”, etc.)