Steam games not launching :(

Fresh install, 3080 and a Ryzen 5 5700. I have steam running in compatibility mode for proton experimental and when trying to launch KCD2.

When running steam through terminal I'm seeing this error:
ERROR: ld.so: object '/var/home/Mushdodo/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Game Recording - would start recording game 1771300, but recording for this game is disabled
Adding process 26876 for gameID 1771300
ERROR: ld.so: object '/var/home/Mushdodo/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/var/home/Mushdodo/.local/share/Steam/ubuntu12_64/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS64): ignored.
ERROR: ld.so: object '/var/home/Mushdodo/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/var/home/Mushdodo/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
WARNING: discarding _NET_WM_PID 5 as invalid for X11 window - use specialized XCB_X11_TO_PID function!


Any ideas what I'm doing wrong. Bit of a newbie, thanks for your help!
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