It appears that when you duplicate collections, scale transformations go a little crazy and many extra objects appear in the hierarchy with the format of “Object (Clone) (Clone) (Clone)” etc. These issues also occur when exporting to FBX; however, all issues can be solved by going into the hierarchy and deleting any of the objects with the (Clone) suffix. Does this make sense? Hopefully this helps. Also, I have been repeatedly experiencing crashes especially when saving scenes. These don’t happen every time, but enough that I thought I’d mention it here.