Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.22
Broken: version: 2.80 (sub 64), branch: master, commit date: 2019-05-15 02:20, hash: rBd09289ff7a8e
When animating using linked character asset sudden error in viewport drawing happens. It happened occasionally not regularly. When present in the scene, its permanent. Helps just deleting proxy and create it from scratch again to get rid of this error.
Hard to describe properly so please check link to video demonstrating it.
Note that we have tested different Blender 2.8x builds and different PC configurations (ie graphic cards - all NVIDIA only) but still this error occured.