Hiya. I just tested what you suggested, and it seems to only happen in my project. With a new project, the collision is saved as usual. What’s weird, however, is that I can save collisions on objects other than the Door SM. I don’t know if there’s a super hidden setting I accidentally enabled, but it does worry me a bit that it could happen again with an object I really need to have collision with. For now, I am not in trouble, as I can just use another Door model that allows me to save collisions.
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