I've got a few objects in my blender file that, when exported individually outside of any collection, export fine, but when exported as a collection for a physics model, it gives me the error "Nothing in Group (Name of group) is enabled for export". I've exported other collections as physics models from the same blend file and they worked fine. The ones that won't work were all separated from a single object, so I assume I did something wrong with that object and it transferred when i separated it, but I can't find what I did wrong