The problem was that this PG (linked in There is an issue with model cloning) failed because of thin instances not being copied when the mesh is cloned.
We think that copying the thin instances when cloning is the right fix, but I understand your point. Maybe we could update the behavior so that cloning doesn’t copy thin instances by default, and add a parameter to clone to force copying the thin instances. What do you think @sebavan and @Deltakosh? This problem only surfaced 3 weeks ago, so I guess only very few people were impacted by the fact that thin instances weren’t copied.