Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-11-06 06:10, hash: `rB9a7da1242d9f`
**Short description of error**
When adding additional constraints on a proxy armature, then converting that proxy to an override, and then saving and reloading the blend file, the additional constraints get lost.
**Exact steps for others to reproduce the error**
- Download both files and put them in the same folder:
- Open coffee_run.blend
- Note the local Copy Transforms constraint on the rig's `P-root` bone.
- Convert to Override (in object mode, with the armature object as active)
- Save and reload
- Constraint is gone.
I can't seem to reproduce this on a fresh file, and what's even more confusing is if you delete all bones in the crowd.5.blend file except for `P-root`, the bug no longer happens.