Offical Proton games immedately quit on start.

**Game information**
Any game running on official proton.

**Distribution name and version where applicable**
NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling

**Flatpak info**
Flatpak 1.15.1
nvidia-525-60-11
default
host

**Problem description**
Pressing start on a proton game immediately quits it out, games only works with GE proton, I've looked around online and it seemed that this problem was fixed in a previous version, however its not the case on my system.

**Does this issue reproduce with native Steam**
Have not tested.

**Steam Logs when I start up the game 'Ready or Not'**

` Game process updated : AppID 1144200 "/home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/reaper SteamLaunch AppId=1144200 -- /home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/steam-launch-wrapper -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/SteamLinuxRuntime_soldier'/_v2-entry-point --verb=waitforexitandrun -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Proton - Experimental'/proton waitforexitandrun '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Ready Or Not/ReadyOrNot.exe' -dx11", ProcID 3933, IP 0.0.0.0:0
Setting breakpad minidump AppID = 1144200
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198307538423 [API loaded no]
Game process updated : AppID 1144200 "/home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/reaper SteamLaunch AppId=1144200 -- /home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/steam-launch-wrapper -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/SteamLinuxRuntime_soldier'/_v2-entry-point --verb=waitforexitandrun -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Proton - Experimental'/proton waitforexitandrun '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Ready Or Not/ReadyOrNot.exe' -dx11", ProcID 3999, IP 0.0.0.0:0
Game process updated : AppID 1144200 "/home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/reaper SteamLaunch AppId=1144200 -- /home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/steam-launch-wrapper -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/SteamLinuxRuntime_soldier'/_v2-entry-point --verb=waitforexitandrun -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Proton - Experimental'/proton waitforexitandrun '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Ready Or Not/ReadyOrNot.exe' -dx11", ProcID 3999, IP 0.0.0.0:0
Setting breakpad minidump AppID = 1144200
SteamInternal_SetMinidumpSteamID: Caching Steam ID: 76561198307538423 [API loaded no]
ThreadGetProcessExitCode: no such process 3996
ThreadGetProcessExitCode: no such process 3982
ThreadGetProcessExitCode: no such process 3976
ThreadGetProcessExitCode: no such process 3970
ThreadGetProcessExitCode: no such process 3964
ThreadGetProcessExitCode: no such process 3942
ThreadGetProcessExitCode: no such process 3939
ThreadGetProcessExitCode: no such process 3933
ThreadGetProcessExitCode: no such process 3929
pid 3935 != 3934, skipping destruction (fork without exec?)
Game process removed: AppID 1144200 "/home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/reaper SteamLaunch AppId=1144200 -- /home/sonny/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/steam-launch-wrapper -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/SteamLinuxRuntime_soldier'/_v2-entry-point --verb=waitforexitandrun -- '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Proton - Experimental'/proton waitforexitandrun '/mnt/e0e0f6ab-98b1-44d8-8174-959d07da43f1/sonny/steam/steamapps/common/Ready Or Not/ReadyOrNot.exe' -dx11", ProcID 3999
ThreadGetProcessExitCode: no such process 3999
ThreadGetProcessExitCode: no such process 3951
ThreadGetProcessExitCode: no such process 3840
Game 1144200 created interface STEAMAPPS_INTERFACE_VERSION008 /
Game 1144200 created interface STEAMAPPTICKET_INTERFACE_VERSION001 /
Game 1144200 created interface STEAMREMOTESTORAGE_INTERFACE_VERSION014 /
Game 1144200 created interface STEAMUSERSTATS_INTERFACE_VERSION012 /
Game 1144200 created interface SteamFriends017 /
Game 1144200 created interface SteamMatchMaking009 /
Game 1144200 created interface SteamMatchMakingServers002 /
Game 1144200 created interface SteamNetworking006 /
Game 1144200 created interface SteamUser017 / User
Game 1144200 created interface SteamUser021 /
Game 1144200 created interface SteamUser021 / User
Game 1144200 created interface SteamUtils007 / Utils
Game 1144200 created interface SteamUtils010 /
Game 1144200 method call count for IClientUserStats::RequestCurrentStats : 1
Game 1144200 method call count for IClientUtils::RecordSteamInterfaceCreation : 14
Game 1144200 method call count for IClientUtils::GetAppID : 17
Game 1144200 method call count for IClientUtils::GetConnectedUniverse : 1
Game 1144200 method call count for IClientUser::BIsSubscribedApp : 1
Game 1144200 method call count for IClientUser::GetAppOwnershipTicketExtendedData : 1
Game 1144200 method call count for IClientUser::GetSteamID : 2
Uploaded AppInterfaceStats to Steam`

_As far as my testing goes, this occurs in other games aswell, such as 'Project Zomboid' and 'Counter-Strike: Source' when they are running in steamplay._

Start by reproducing the failure in Flatpak Steam with official Proton using Ready Or Not (AppID 1144200), then compare it with GE Proton and the other mentioned Steamplay games. Review the Steam launch output and determine what evidence distinguishes the affected games from working launches; done means official Proton starts the affected games successfully.

Written by the indexing model from the issue text.