Dear ,
I have reproduced the Bug in a clean project and steps as you have asked. It is now confirmed this bug is not caused by bad references or file serialization debris from older bugs. It is also present in simple Level references which renders 4.18 unready for prime time development. So I have created a newer, simpler bug report. If I was in charge of developing and fixing these referencing systems however, I would still want to see the reports and examples here.