Pretty big bug I'd say?
Hello,
Thank you for reaching out, it does appear to be a bug and we'd like to investigate this further. Can you please submit a bug report using the Contact Us button on the Twinmotion Community home page? When submitting the report, please provide your computer specifications and a .tm file the issue occurs in so that we may test the issue on our side as well. We ask that you use the Resource Collector to create a compressed/zipped folder of the project, so that we may view the file as you are seeing it on your side.
Best Regards,
Morgan