Versions: SPT: 4.0.13 - FIKA: 2.2.3 (server), 2.2.1 (clients)
Networking: We are all using RadminVPN.
Description: Presently, the only near-guaranteed fix is restarting the server and headless client.
The issue consists of visual desync in that the character of the other connected client (non-host/initiator) is static and does not move, however all of their actions affect the world: AI properly locates them, they are able to take and deal damage, interact with items, etc.
Both of us have force-bound our IPs and done all of the other typical placebo things as well (don't enter too quick, try going straight to the raid from restart, normal reactions)
I've read other people having similar issues resolved by force-binding their IP but they weren't using a VPN, port forwarding is not an option for me.