I have 3 similarly built characters in spine that all have "belly patch" masks that use clippers to cut them in the shape of the body graphic, all are done in the same way. I recently changed the export settings to make 512x512 size sheets, which resulted in 2 separate sheets each. When imported to Unity, 2 of the characters clippings were broken, and 1 was fine. I checked, and it seems those 2 characters had their belly patch and body graphics in separate sheets, where as the one that worked had it's belly patch and body graphics in the same sheet. This was the only difference I could find between the characters.
I use version 3.6.53 for my project. Wondering if the newest spine version has this issue fixed, and if I should inform our team to upgrade our Spine version, or if this is a general bug.
