I noticed that duplicating bones with weighted meshs behave differently when the mesh is contained in a skin placeholder slot. Namely they will still be bound to the original rather than the duplicate.
I recorded a video of both ways:
Spine: Problem duplicating weighted meshs in skin slots - YouTube
Also I realized that undoing the duplicating step will cause a crash - I attached the log.
Thanks for the crash log and repro steps. We are looking into it. I've opened an issue on the tracker here Duplicating weighted skins in skin slot, does not behave as expected, undo crashes · #148 · EsotericSoftware/spine-editor
I'm sorry so much time has past on this issue!
I tried reproducing the problem by duplicating various raptor bone (leg, hip, etc), but it worked fine. I'm guessing something about the complexity of your skeleton is causing the problem. I'm very interested to know what it is! If you could please post or email the .spine file, that would be very helpful: contact@esotericsoftware.com You don't need to send all the images.
