Farewell League of Linux </3

I have probably installed League on Arch with Lutris 10s of times, but now it isn't working somehow.
Installation went as it always did. I did not sign in at the Riot Launcher the first time, but quit it. The relaunched, logged in and clicked on Play.
Nothing. I can now launch League through Lutris. I get the Riot Client but nothing else. I can see in my Taskbar, that an opengl windows opens, but it shows nothing and goes away after a minute.

When i switch the wine Version from GE-Proton to System (8.13), i can at least see the transparen LoL Logo, but the Client still won't launch.
I'm at a loss here. Am i doing something wrong?

Log for the Last run:

lutris-wrapper: League of Legends
Started initial process 8380 from /home/user/.local/share/lutris/runners/wine/lutris-GE-Proton8-12-x86_64/bin/wine /home/dominik/Games/league-of-legends/drive_c/Riot Games/Riot Client/RiotClientServices.exe --locale=en_US --launch-product=league_of_legends --launch-patchline=live
Start monitoring process.
fsync: up and running.
wine: RLIMIT_NICE is <= 20, unable to use setpriority safely

(wine:8501): GStreamer-WARNING **: 13:49:45.484: Failed to load plugin '/home/user/.local/share/lutris/runners/wine/lutris-GE-Proton8-12-x86_64/lib64/gstreamer-1.0/libgstflac.so': libFLAC.so.8: cannot open shared object file: No such file or directory

(wine:8501): GStreamer-WARNING **: 13:49:45.484: Failed to load plugin '/home/dominik/.local/share/lutris/runners/wine/lutris-GE-Proton8-12-x86_64/lib/gstreamer-1.0/libgstflac.so': /home/user/.local/share/lutris/runners/wine/lutris-GE-Proton8-12-x86_64/lib/gstreamer-1.0/libgstflac.so: wrong ELF class: ELFCLASS32
wine: configuration in L"/home/dominik/Games/league-of-legends" has been updated.

(wine:8857): GStreamer-WARNING **: 13:49:56.501: Failed to load plugin '/home/user/.local/share/lutris/runners/wine/lutris-GE-Proton8-12-x86_64/lib64/gstreamer-1.0/libgstflac.so': libFLAC.so.8: cannot open shared object file: No such file or directory

(wine:8857): GStreamer-WARNING **: 13:49:56.501: Failed to load plugin '/home/user/.local/share/lutris/runners/wine/lutris-GE-Proton8-12-x86_64/lib/gstreamer-1.0/libgstflac.so': /home/dominik/.local/share/lutris/runners/wine/lutris-GE-Proton8-12-x86_64/lib/gstreamer-1.0/libgstflac.so: wrong ELF class: ELFCLASS32