Sorry, my bad. I've attached the required files and tested the savegame in singleplayer where the issue does not appear.

I'll attach the server-side logs shortly after posting this.

All 3 of us have noticed really annoying flickering when dragging around the screen with the mouse but it does not happen while scrolling with WASD.
I looked around quite a bit but could not find a solution for this specific behaviour. It only started after the game progressed a bit. We didn't ...