here reply from support june 2026:
Hello,
Thank you for contacting Twinmotion Support.
This is currently a technical limitation of the physics system in Twinmotion. Pedestrian mode wasn’t designed to support moving platforms, which is why this can “break” when you step onto moving objects.
We can investigate improvements here, but any such changes would require a long-term effort to revamp the physics system to support this. Unfortunately, this is not something we expect would be available any time soon.
i thought it would be quite easy to do… BUT anyway, i think it is a very important feature for architectural presentations