Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.86
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-20 14:27, hash: rB26bd5ebd42e3
Short description of error
Blender crash when making a library override on a rig or mesh with rig, if not, blender crash when you try to pose the character
Exact steps for others to reproduce the error
1 - Create a Blender file with a rigged mesh.
2 - Link the collection of the rigged mesh in another blender file.
3 - Try to create a library override on the rig or the mesh
4 - If blender didn't crash try to pose the character and pressing Ctrl+Z
(The error seems to have a little randomness)
When Blender don't crash the mesh has lost their weights