Hello, I'd like to report a bug.
If you rename a bone which having a slot with same name, with option Rename slot checked, to a name that a slot with that name are already exist, you will succesfully rename them and end up getting 2 slots with same name (which, I guess, should not be done)
With the same step as above, having more than 2 slots that share the same name is also doable
I found it in spine 3.8.99, the same result when I use latest spine (4.0.33)
Yet, I don't know if this cause any problem (I've just found it, never tested if there is problem).