Operating system: Linux-5.3.0-29-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: rBf1aa4d18d49d
Worked: Works fine in 2.80
Short description of error
A rigged object is linked into a scene, and a proxy armature is created and animated. When rendered, there are glitches in some random frames, where the object moves out of position.
Exact steps for others to reproduce the error
See the attached production/scenes/scene02 .blend file. The cow is rendered with glitches.
Edit: updated test file: