I would say, try backing up your saves and deleting the proton prefix from both devices. Recreate them and then try again. Hopefully that will reset things. I will say that Cyberpunk saves have been transferring over fine for me, so could just be that something glitched up and you just need to wipe and reset.
How can you tell it’s a symlink?
If you’re in the command line, typing ls -la will show links using an arrow -> notation. If you’re in a desktop environment, the file manager should tell you by showing a small link icon in the bottom left or right corner of the file icon. https://lemmy.world/pictrs/image/aeb25b39-aae8-4832-85f3-9973c8d70cc1.png