Game will launch and allow you to interact with menus etc, and then will freeze (no crash) on starting a new game. Switching to proton 4.2-9 will allow the game to load and run. It also appears that after launching and starting a game with 4.2-9, you can switch back to experimental/any version and the game will load a save (and a new game from scratch too), although i haven't tested this much.
Reproduction
Using any proton version except 4.2-9, start the game. At the main menu, press new game. The game will freeze. Switching to 4.2-9 will allow the game to load the tutorial mission.
Compatibility Report
System Information
I confirm:
steam-973230.log
Symptoms
Game will launch and allow you to interact with menus etc, and then will freeze (no crash) on starting a new game. Switching to proton 4.2-9 will allow the game to load and run. It also appears that after launching and starting a game with 4.2-9, you can switch back to experimental/any version and the game will load a save (and a new game from scratch too), although i haven't tested this much.
Reproduction
Using any proton version except 4.2-9, start the game. At the main menu, press new game. The game will freeze. Switching to 4.2-9 will allow the game to load the tutorial mission.