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Latest GE proton version
Connection Lost after playing the game for a couple of mins
Kicked out of public games within a couple of minutes

Constant disconnects even in campaigns likely due to EAC.

Proton-6.14-GE-2 GloriousEggroll
Proton-6.14-GE-2
I kept having that popup "Disconnected from server / Your connection to Online Services was lost. Reconnect ?" and kick me out of the multiplayer game few seconds after joining the server. Certainly due to EAC.
EAC disconnects you from server each time you join an online matchmaking

Game launches, Lobby starts and runs smooth, multiplayer doesn't work
So the game launches, runs the lobby butter smooth. But when I get into a game. I'm instantly pushed from the server to the lobby, Where I can join back for about 3 minutes. Where after I'm disconnected again.
well, the game works but eac kicks me out of the game.

6.14-GE-2 GloriousEggroll
Used Proton-6.14-GE-2
Game works perfectly fine with great performance but multiplayer is impossible to play since I get disconnected every ~30 seconds.

Crash on start
I wasn't even able to open the game.

6.14-GE-2 GloriousEggroll
Chat not working

Short lags when viewing something the first time

Proton-6.14-GE-2 GloriousEggroll
Linux is unable to connect to the chat server. Unable to communicate with other players other than pings
Easy Anti-Cheat = Easy Fail
Doesn't start up because of Easy Anti-Cheat.
I really wish that (a) people wouldn't cheat (unless everyone is cheating together to have fun and they all know about it) and (b) game devs would stop adding this shit - even if people cheat, that's a community thing to deal with. Anti-cheat -> never gonna work on WINE / Proton ): and they coulda had free Linux support.
EAC anti-cheat system throws out every 30 seconds when connected to the server

Getting disconnected very few minutes from online lobbys
Game works fine until you get disconnected from the lobby

Starts both in DX11 and DX12 modes perfectly, runs great but EAC is going to kick you from the server continuously
kicks you from session every ~30 seconds
Tested on: Proton-6.14-GE-2

You'll get kicked out of multiplayer matches within seconds.
If you join your friends and stay in the hub, it just works fine. But if you search a multiplayer match or just create a private match, you'll get kicked to the main menu in just seconds. I even disabled crossplay and forwarded the necessary ports on my router.

6.14-GE-2 GloriousEggroll
Getting kicked every 30sec after joining a game
It install's, but freezes onloading screen. cannot get into the main menu

Update: Won't run on Proton 6.3-5
Becaus Proton 6.3-5 is the lates official release I also tried that. Bud than the game freezes at the start untill I force quit after a view minutes.

To bad :-( I cannot play it.
I tried to play the Beta and needed Proton-6.14-GE-2 on steamlinux to get it to run. I have been in the gamelobby where I can see constantly that the connection to the chatservers is lost and that "we" try to reconnect. I never use a chatserver but was not able to turn the chatserver of. I played the game "RUN" for a view seconds before loosing the connection to the gameserver. After trying to login again someone else had my place and I can only play as a spectator. So the lobby looks fine. Bud the game cannot be played (jet) No! I wil not become an Windows user :-) I also have tried it with older Proton versions but than the screen freezes. And with Proton-6.14-GE-2 only the connections get lost so thats it. To bad :-( I cannot play it.

Proton-6.14-GE-2 GloriousEggroll
A custom version of Proton-GE is required : https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/6.14-GE-2
Probably because EAC, after join a game shortly got kicked back to campus, message shows disconnect from server.

Non stop server disconnects
The game will install and run, but as soon as you try to join a game, or have other players join you, the game will disconnect from server approximately every 30 seconds. This reeks of EAC interference at this point. I suspect they changed something from the closed beta to the open beta and EAC is now blocking this from running properly when joining other players in a game.

Gets Stuck at Splash Screen
Couldn't reach the main menu.

Can't play online without getting disconnected.
During online I kept disconnecting.
Online gameplay keeps disconnecting

Easy Anti-Cheat
EAC prevents playing the game
Proton-6.14-GE-2 GloriousEggroll
Finding server seems impossible, could be just the beta

6-14-GE-2 GloriousEggroll
6-14-GE-2
EAC Keeps kicking me
Freezes on start-up on Proton, and gives an Error on GE.
Game will start up using Proton 6.3-5, however it will get stuck on the inital start-up screen and never continue. Attempting to use Proton-6.1-GE-2 results in an error reading "The follwing component(s) are required to run this program: Microsoft Visual C++ 2015 Runtime"
Seems likely that most of the performance bugs are open beta related; will be curious to see if anti-cheat is an issue on launch.

The game is running just fine, it's still a beta so some bugs might not be due to SteamPlay.
The game launches with Easy Anti Cheat, either it is not enable or this is a new version of EAC that works on Linux?
Correction from my last post, 6.14-GE-2 is what i had to use for the game to launch, Experimental also launches the game but freezes on the main screen.

Does not launch due to Easy Anti Cheat.
Tried 6.3-5, Experimental, and 6.14-GE-2, beware that closed beta for pre-order worked because Easy Anti Cheat was disable, the full game will not work when released.
Freezes at loading screen. Upon reading other reviews, this seems to be a very new issue with the open beta.

Normal Proton froze in loading, GE worked. Game uses DXVK and plays well, with normal performance hit caused by Compatibility Layer.

Didn't get past splash, using 6.14-GE-2
EAC

Game doesn't start properly
With the current proton experimental version the was game able to show at least an initial Back4Blood splash screen. But with all the other proton versions which I had (I tested about 5 ones) it stopped working after the Easy Anti Cheat software was done loading.

Proton-6.14-GE-2 GloriousEggroll
Game did not start
Anything before Proton version 6.14 freezes in initial pre-menu screen