System Information
Operating system: Window 7
Graphics card: Quadro FX 4800
Blender Version
Broken: (blender-2.80.0-git.9c5d54bfaf48-windows64)
Worked: (blender 2.79b)
Short description of error
The Child of Constraint of bone, when parented to a vertex group, the Set Inverse feature doesn't works. Bone will keep in its deformed location.
Exact steps for others to reproduce the error
Open the bone child of vertex set inverse .blend, select the bone and try to click Set Inverse. Nothing happened. This should works on Blender 2.79b.