First of all, while I’d like a fix, I don’t expect that any of you will have one right now, so if you want to ignore this because: “Oh god, another one.” go ahead. I don’t mind. Having a quick look through the gaming section, it seems to be the same for everyone. (But dear god stop nagging people over their NTFS-partitions, we get it, it’s not ideal for linux, but it’s really not the point with the current wide-spread problem.) 
For example, I’m trying to launch Doom Eternal, which worked just fine a few weeks ago.
I have tried a lot of things, I’ve even tried timeshift to over 2 weeks back. Any Proton-Game I launch will fail silently.
Yes, I’m on steam-manjaro, I’ve tried -native, absolutely no difference.
No, my games are not on an NTFS drive, but on a quite new and clean ext4 partition on an SSD that I use for my bigger games.
I even tried Jamestown, moving the installation folder directly on my OS partition, didn’t work.
Native games seem to be no problem, tested with Caves of Qud and Steredenn.
My Guild Wars 2 lutris installation runs just fine too.
Here is steams terminal output while trying to launch DooG Eternal:
GameAction [AppID 782330, ActionID 2] : LaunchApp changed task to ProcessingInstallScript with ""
fsync: up and running.
wine: RLIMIT_NICE is <= 20, unable to use setpriority safely
GameAction [AppID 782330, ActionID 2] : LaunchApp changed task to SynchronizingCloud with ""
GameAction [AppID 782330, ActionID 2] : LaunchApp changed task to SiteLicenseSeatCheckout with ""
GameAction [AppID 782330, ActionID 2] : LaunchApp changed task to CreatingProcess with ""
GameAction [AppID 782330, ActionID 2] : LaunchApp waiting for user response to CreatingProcess ""
GameAction [AppID 782330, ActionID 2] : LaunchApp continues with user response "CreatingProcess"
/bin/sh\0-c\0PROTON_NO_ESYNC=1 /home/nys/.local/share/Steam/ubuntu12_32/reaper SteamLaunch AppId=782330 -- '/mnt/steamLib2_ntfs/Steam/steamapps/common/SteamLinuxRuntime_soldier'/_v2-entry-point --verb=waitforexitandrun -- '/mnt/steamLib2_ntfs/Steam/steamapps/common/Proton 6.3'/proton waitforexitandrun '/mnt/steamLib1/SteamLibrary/steamapps/common/DOOMEternal/idTechLauncher.exe' +in_terminal 1 +com_skipIntroVideo 1\0
Game update: AppID 782330 "", ProcID 9200, IP 0.0.0.0:0
ERROR: ld.so: object '/home/nys/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Starting app 782330
>>> Adding process 9200 for game ID 782330
GameAction [AppID 782330, ActionID 2] : LaunchApp changed task to WaitingGameWindow with ""
ERROR: ld.so: object '/home/nys/.local/share/Steam/ubuntu12_64/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS64): ignored.
ERROR: ld.so: object '/home/nys/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
GameAction [AppID 782330, ActionID 2] : LaunchApp changed task to Completed with ""
ERROR: ld.so: object '/home/nys/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/nys/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
pid 9204 != 9201, skipping destruction (fork without exec?)
>>> Adding process 9201 for game ID 782330
>>> Adding process 9202 for game ID 782330
>>> Adding process 9508 for game ID 782330
>>> Adding process 9512 for game ID 782330
fsync: up and running.
wine: RLIMIT_NICE is <= 20, unable to use setpriority safely
>>> Adding process 9514 for game ID 782330
>>> Adding process 9515 for game ID 782330
>>> Adding process 9518 for game ID 782330
>>> Adding process 9520 for game ID 782330
>>> Adding process 9523 for game ID 782330
>>> Adding process 9530 for game ID 782330
>>> Adding process 9536 for game ID 782330
>>> Adding process 9546 for game ID 782330
>>> Adding process 9551 for game ID 782330
Game update: AppID 782330 "", ProcID 9514, IP 0.0.0.0:0
RecordSteamInterfaceCreation (PID 9514): SteamUtils009 / Utils
Setting breakpad minidump AppID = 782330
RecordSteamInterfaceCreation (PID 9514): SteamUser019 / User
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198022208529 [API loaded no]
RecordSteamInterfaceCreation (PID 9514): SteamUser019 / User
RecordSteamInterfaceCreation (PID 9514): SteamFriends015 / Friends
RecordSteamInterfaceCreation (PID 9514): SteamUtils009 / Utils
RecordSteamInterfaceCreation (PID 9514): SteamMatchMaking009 / Matchmaking
RecordSteamInterfaceCreation (PID 9514): SteamMatchMakingServers002 / MatchmakingServers
RecordSteamInterfaceCreation (PID 9514): STEAMUSERSTATS_INTERFACE_VERSION011 / UserStats
RecordSteamInterfaceCreation (PID 9514): STEAMAPPS_INTERFACE_VERSION008 / Apps
RecordSteamInterfaceCreation (PID 9514): SteamNetworking005 / Networking
RecordSteamInterfaceCreation (PID 9514): STEAMREMOTESTORAGE_INTERFACE_VERSION014 / RemoteStorage
RecordSteamInterfaceCreation (PID 9514): STEAMSCREENSHOTS_INTERFACE_VERSION003 / Screenshots
RecordSteamInterfaceCreation (PID 9514): STEAMHTTP_INTERFACE_VERSION002 / HTTP
RecordSteamInterfaceCreation (PID 9514): SteamController006 / Controller
RecordSteamInterfaceCreation (PID 9514): STEAMUGC_INTERFACE_VERSION010 / UGC
RecordSteamInterfaceCreation (PID 9514): STEAMAPPLIST_INTERFACE_VERSION001 / AppList
RecordSteamInterfaceCreation (PID 9514): STEAMMUSIC_INTERFACE_VERSION001 / Music
RecordSteamInterfaceCreation (PID 9514): STEAMMUSICREMOTE_INTERFACE_VERSION001 / MusicRemote
RecordSteamInterfaceCreation (PID 9514): STEAMHTMLSURFACE_INTERFACE_VERSION_004 / HTMLSurface
RecordSteamInterfaceCreation (PID 9514): STEAMINVENTORY_INTERFACE_V002 / Inventory
RecordSteamInterfaceCreation (PID 9514): STEAMVIDEO_INTERFACE_V002 / Video
RecordSteamInterfaceCreation (PID 9514): STEAMPARENTALSETTINGS_INTERFACE_VERSION001 / ParentalSettings
>>> Adding process 9558 for game ID 782330
pid 9516 != 9515, skipping destruction (fork without exec?)
Game removed: AppID 782330 "", ProcID 9514
Game 782330 created interface STEAMAPPLIST_INTERFACE_VERSION001 / AppList
Game 782330 created interface STEAMAPPS_INTERFACE_VERSION008 / Apps
Game 782330 created interface STEAMHTMLSURFACE_INTERFACE_VERSION_004 / HTMLSurface
Game 782330 created interface STEAMHTTP_INTERFACE_VERSION002 / HTTP
Game 782330 created interface STEAMINVENTORY_INTERFACE_V002 / Inventory
Game 782330 created interface STEAMMUSICREMOTE_INTERFACE_VERSION001 / MusicRemote
Game 782330 created interface STEAMMUSIC_INTERFACE_VERSION001 / Music
Game 782330 created interface STEAMPARENTALSETTINGS_INTERFACE_VERSION001 / ParentalSettings
Game 782330 created interface STEAMREMOTESTORAGE_INTERFACE_VERSION014 / RemoteStorage
Game 782330 created interface STEAMSCREENSHOTS_INTERFACE_VERSION003 / Screenshots
Game 782330 created interface STEAMUGC_INTERFACE_VERSION010 / UGC
Game 782330 created interface STEAMUSERSTATS_INTERFACE_VERSION011 / UserStats
Game 782330 created interface STEAMVIDEO_INTERFACE_V002 / Video
Game 782330 created interface SteamController006 / Controller
Game 782330 created interface SteamFriends015 / Friends
Game 782330 created interface SteamMatchMaking009 / Matchmaking
Game 782330 created interface SteamMatchMakingServers002 / MatchmakingServers
Game 782330 created interface SteamNetworking005 / Networking
Game 782330 created interface SteamUser019 / User
Game 782330 created interface SteamUtils009 / Utils
Game 782330 method call count for IClientUtils::RecordSteamInterfaceCreation : 22
Game 782330 method call count for IClientUtils::GetSteamUILanguage : 1
Game 782330 method call count for IClientUtils::GetAppID : 24
Game 782330 method call count for IClientUser::GetSteamID : 1
Uploaded AppInterfaceStats to Steam
Exiting app 782330
No cached sticky mapping in ActivateActionSet.
inxi:
System: Host: redacted Kernel: 5.10.61-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 Desktop: Xfce 4.16.0
Distro: Manjaro Linux base: Arch Linux
Machine: Type: Desktop Mobo: Micro-Star model: MPG X570 GAMING PLUS (MS-7C37) v: 2.0 serial: <superuser required>
UEFI: American Megatrends LLC. v: A.E0 date: 06/22/2021
CPU: Info: 6-Core model: AMD Ryzen 5 3600 bits: 64 type: MT MCP arch: Zen 2 rev: 0 cache: L2: 3 MiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 86440
Speed: 3713 MHz min/max: 2200/3600 MHz boost: enabled Core speeds (MHz): 1: 3713 2: 2056 3: 3506 4: 1938 5: 2057
6: 2063 7: 3298 8: 1977 9: 3592 10: 2057 11: 2057 12: 1943
Graphics: Device-1: Advanced Micro Devices [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] vendor: Gigabyte
driver: amdgpu v: kernel bus-ID: 2d:00.0
Display: x11 server: X.Org 1.20.13 driver: loaded: amdgpu,ati unloaded: modesetting resolution: 1: 1920x1080~144Hz
2: 1920x1080~60Hz
OpenGL: renderer: Radeon RX 590 Series (POLARIS10 DRM 3.40.0 5.10.61-1-MANJARO LLVM 12.0.1) v: 4.6 Mesa 21.2.1
direct render: Yes
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Micro-Star MSI X570-A PRO driver: r8169
v: kernel port: d000 bus-ID: 27:00.0
IF: enp39s0 state: up speed: 100 Mbps duplex: full mac: 00:d8:61:d4:87:e1
Drives: Local Storage: total: 3.42 TiB used: 996.92 GiB (28.5%)
ID-1: /dev/nvme0n1 vendor: Crucial model: CT1000P1SSD8 size: 931.51 GiB temp: 37.9 C
ID-2: /dev/sda vendor: Western Digital model: WD10EARS-00Y5B1 size: 931.51 GiB
ID-3: /dev/sdb vendor: Seagate model: ST1500DL003-9VT16L size: 1.36 TiB
ID-4: /dev/sdc vendor: SanDisk model: SDSSDHP128G size: 119.24 GiB
ID-5: /dev/sdd vendor: Intenso model: SSD Sata III size: 118 GiB
Partition: ID-1: / size: 391.66 GiB used: 54.85 GiB (14.0%) fs: ext4 dev: /dev/nvme0n1p3
ID-2: /boot/efi size: 511 MiB used: 284 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1
Info: Processes: 336 Uptime: 1h 15m Memory: 31.34 GiB used: 4.92 GiB (15.7%) Init: systemd Compilers: gcc: 11.1.0
Packages: 1351 Shell: Bash v: 5.1.8 inxi: 3.3.06
Anyway, I hope that some update sooner or later will just fix this entire mess. I guess this is the point where Manjaro can get a bit annoying for gamers.