I get this a lot while playing with my GF. We are only two on our server.
Often I will see her standing still with a running animation etc. Odd thing is it also makes me unable to do stuff like open chests.
Some of the times it will lead to her disconnecting entirely.

We have tried:
Lan/Internet
Dedicated or non- dedicated server
Vulkan/DX11
Run game as admin
Allow game in firewall