I’ve installed “Overcooked 2” and “Moving Out” through Heroic Games Launcher (flatpak) and then used the ad-hoc option to add it to steam (also installed as flatpak). If I try to launch the game from Heroic it works properly, and it works also if I try to launch it from the command line with the command it added to steam

flatpak run com.heroicgameslauncher.hgl --no-gui --no-sandbox "heroic://launch/legendary/8e29583ae4b44a21883038668f7e301e"

but if I click the PLAY button on steam, the game fails to launch and the following error is printed on terminal:

chdir "/var/home/lez"
Game Recording - would start recording game 12260096395435835392, but recording for this game is disabled
Adding process 532 for gameID 12260096395435835392
ERROR: ld.so: object '/var/home/lez/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/var/home/lez/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/var/home/lez/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_64/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS64): ignored.
pid 534 != 532, skipping destruction (fork without exec?)
Game Recording - game stopped [gameid=12260096395435835392]
Removing process 532 for gameID 12260096395435835392

Anyone else faced this issue? If so how did you fixed it?