[2.0.32] Winning game causes flicker; makes save unplayable

[i-make-robots]

0.000 2025-01-21 10:04:32; Factorio 2.0.32 (build 81349, win64, steam, space-age)
0.000 Operating system: Windows 11 (build 22631)

Multiplayer game hosted by my friend. Reached the edge of space.
Win screen and achievement OK. I upload to the galaxy OK.
Ship destination now flickering between edge of space and Aquillo every frame.
Cannot continue save file. Cannot run autosave from 20 minutes earlier.

Without anything else to go on, I assume it's something about having the achievement that is breaking the game.

Save file will be attached in a follow up post, I have to get it from the host player. Do you want the hosts' log file? I think he's already tried to quit and run again a few times, so not sure if that's useful.

[i-make-robots]

Can confirm it does NOT affect other save files. So it may have something to do with the process of uploading to galaxy?
Still waiting for host to deliver save file.