allo Antoine, this could be the same issue, you can see in the beta Schwaninger land thread
what now is know as "the red carpet" bug, as if surveyor only no longer works as before
there is a fix but not sure I want to fix thousands of items here
I wonder if the default was changed to the surveyor-only tag so that this tag now has to be implicit in the assets. With assets that don't have the tag, and there will be gazillions of them, then these assets will display their hidden parts in driver.