Same situation still with 6.3-8: game is frozen at "please wait". There is repeated message of "Autosavecore failed" in the log so I would guess it is trying to create autosave-file but fails for some reason? [steam-4524...
With Proton 3.16-7 Beta this game runs, but the game is unable to open menu (freezed at "Please wait" animation). Log file: [steam-452420.log](https://github.com/ValveSoftware/Proton/files/2871868/steam-452420.log)