@Vincent Boutaud​ this issue has been plaguing Twinmotion -> UE -> Oculus Quest for years. and AFAIK the posts about the same issue in UE forum did not get any reply from Epic.
they are full with people not finding solutions and/or giving up.
If Twinmotion -> UE -> Oculus Quest feature works properly, (or even better if Twinmotion can directly deploy android APK for Oculus Quest) it will be a huge boon for archviz and education. as it would substantially reduce the skill barrier to make a standalone oculus quest vr experience.