I have the game running without the black screen you are describing and when the game launches it starts that cut-scene I see what is happening, however not with either ProtonGE or Proton Experimental or other versions of Proton. With ProtonGE it refuses to launch and with Proton Experimental(and other higher and lower versions) I get the same issues you describe and when the cut scene is over I don't even see a menu.
The only way I got it to launch without any issues is by using the native version. Right click on the game, select properties then Compatibility, then put a check next to "Force the use of a specific Steam Play Compatibility tool". Then at the bottom select "Steam Linux Runtime". Your game will have an update, install it then try launching the game. I tried multiplayer but it took to long to find someone to play against, so I cancelled the search. I'm not sure if it's my type of game but I will try the campaign when I am bored of my other games.
The only way I got it to launch without any issues is by using the native version. Right click on the game, select properties then Compatibility, then put a check next to "Force the use of a specific Steam Play Compatibility tool". Then at the bottom select "Steam Linux Runtime". Your game will have an update, install it then try launching the game. I tried multiplayer but it took to long to find someone to play against, so I cancelled the search. I'm not sure if it's my type of game but I will try the campaign when I am bored of my other games.