Hello ,
Thank you for posting in the community and there does seem like an issue potentially with the 3D view open or initially used to synchronize having issue. Make sure you are using the Datasmith Exporter plugin for Revit 5.0.3v2 in order to work with Twinmotion 2023.1.
Please contact us and report a bug so we can best investigate if the problem is still on-going by following this link:
https://twinmotionhelp.epicgames.com/s/case-community-page
Kind regards,
Vincent B.