@ahoeben @nallath Oh good, it's a feature instead of a bug 😵 (I haven't seen its benefit, maybe move it to the add-on plugin if it's only useful for very few users) I thought I never touched that setting, I don't know why it's checked. If you found many people has such strange situation, it couldn't be an accident or misunderstanding from my software product experience. It might be caused by some bug, think about why changing filament (PETG->PLA->PETG) can solve it, that might be a clue.
Another minor bug is sometimes (30% chance) the object models are not movable/controllable, restart the app will solve it. (Env: MacOS v11.1 Big Sur, Macbook Air M1, Cura 4.8.0. )