This prevents the game from loading upon next startup, since unity, or windows, or something really hates certain characters in filenames. There's a reason that the game changes the craft filenames themselves to replace them with underscores, and I think this might be it.
For context, I'm running the game on Linux Mint 21.3 Cinnamon through Proton, with a Ryzen 5 5600G and a Radeon RX 6650 XT