I run into this issue frequently as client, and usually, other clients in the same lobby will have the issue as well. The carver for the Caretaker doesn't register, and standing on a carved area as a client will noclip you through the floor, usually into the abyss.

Whatever causes the carver to not register is likely a client issue, as hitboxes are determined by the host's game. I run into this issue rather rarely, perhaps once for every ten Industrial Sabotage missions.
I can definitely recall the carver not appearing on a mission in which the Caretaker was positioned directly in the "intersection" portion of RMA_MediumCenter1. I later had the same cave generation in a solo Sabotage mission, and the carver worked as intended.

Attached footage was taken with client-side mods enabled (all cosmetic/verified) in an entirely vanilla lobby (host has never downloaded mods).