Steam doesn't launch (crashes), "dlmopen steamclient.so failed: steamclient.so: failed to map segment from shared object"

This has been happening since a few days. I had the Steam client beta enabled which I guess has something to do with it, but I'm unsure how to disable that when not being able to open the application. I uninstalled the Flatpak, wiped ~/.var/app/com.valvesoftware.Steam and reinstalled it, but that didn't help.

$ flatpak run com.valvesoftware.Steam
F: Filesystem suffix "create" is not applicable for --nofilesystem
INFO:root:https://github.com/flathub/com.valvesoftware.Steam/wiki
INFO:root:Will set XDG dirs prefix to /home/bart
DEBUG:root:Checking input devices permissions
INFO:root:Overriding TZ to Europe/Amsterdam
steam.sh[2]: Running Steam on org.freedesktop.platform 22.08 64-bit
steam.sh[2]: STEAM_RUNTIME is enabled automatically
setup.sh[77]: Steam runtime environment up-to-date!
steam.sh[2]: Steam client's requirements are satisfied
[2023-05-31 08:59:53] Startup - updater built May 23 2023 21:39:09
[2023-05-31 08:59:53] Startup - Steam Client launched with: '/home/bart/.local/share/Steam/ubuntu12_32/steam' '-no-cef-sandbox'
[2023-05-31 08:59:53] Opted in to client beta 'publicbeta' via beta file
You are in the 'publicbeta' client beta.
05/31 08:59:53 Init: Installing breakpad exception handler for appid(steam)/version(1684885503)/tid(152)
amdgpu_device_initialize: amdgpu_query_info(ACCEL_WORKING) failed (-38)
amdgpu: amdgpu_device_initialize failed.
libGL error: glx: failed to create dri3 screen
libGL error: failed to load driver: radeonsi
[2023-05-31 08:59:54] Loading cached metrics from disk (/home/bart/.local/share/Steam/package/steam_client_metrics.bin)
[2023-05-31 08:59:54] Using the following download hosts for Public, Realm steamglobal
[2023-05-31 08:59:54] 1. https://client-update.akamai.steamstatic.com, /, Realm 'steamglobal', weight was 1000, source = 'update_hosts_cached.vdf'
[2023-05-31 08:59:54] 2. https://cdn.cloudflare.steamstatic.com, /client/, Realm 'steamglobal', weight was 1, source = 'update_hosts_cached.vdf'
[2023-05-31 08:59:54] 3. http://media.steampowered.com, /client/, Realm 'steamglobal', weight was 1, source = 'baked in'
[2023-05-31 08:59:54] Verifying installation...
[2023-05-31 08:59:54] Verification complete

(process:152): GLib-GObject-CRITICAL **: 08:59:55.596: g_object_ref: assertion 'G_IS_OBJECT (object)' failed

(process:152): GLib-GObject-CRITICAL **: 08:59:55.597: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Loaded SDL version 3.0.0-1568-ga9c988b2a
src/common/friendsuihelpers.cpp (50) : Is64BitOS()
src/common/friendsuihelpers.cpp (50) : Is64BitOS()
05/31 08:59:56 Init: Installing breakpad exception handler for appid(steam)/version(1684885503)/tid(152)
XRRGetOutputInfo Workaround: initialized with override: 0 real: 0x1fc388f0
XRRGetCrtcInfo Workaround: initialized with override: 0 real: 0x1fc371c0
amdgpu_device_initialize: amdgpu_query_info(ACCEL_WORKING) failed (-38)
amdgpu: amdgpu_device_initialize failed.
libGL error: glx: failed to create dri3 screen
libGL error: failed to load driver: radeonsi
GetWin32Stats: display was not open yet, good
ComputeStartupMode: found registry default startup mode: 0
Switching to desktopui, since -vgui was not specified
src/common/html/chrome_ipc_client.cpp (291) : Is64BitOS()
src/common/html/chrome_ipc_client.cpp (291) : Is64BitOS()
src/common/html/chrome_ipc_client.cpp (291) : Is64BitOS()
src/common/html/chrome_ipc_client.cpp (291) : Is64BitOS()
src/common/html/chrome_ipc_client.cpp (291) : Is64BitOS()
src/common/html/chrome_ipc_client.cpp (291) : Is64BitOS()
amdgpu_device_initialize: amdgpu_query_info(ACCEL_WORKING) failed (-38)
amdgpu: amdgpu_device_initialize failed.
libGL error: glx: failed to create dri3 screen
libGL error: failed to load driver: radeonsi
dlmopen steamclient.so failed: steamclient.so: failed to map segment from shared object
dlmopen /home/bart/.local/share/Steam/linux32/steamclient.so failed: /home/bart/.local/share/Steam/linux32/steamclient.so: failed to map segment from shared object
dlmopen steamclient.so failed: steamclient.so: failed to map segment from shared object
src/common/steam/client_api.cpp (593) : ClientAPI_InitGlobalInstance: InternalAPI_Init_Internal failed, most likely because you are missing a 32-bit dependency of steamclient.so (the Steam client is a 32-bit app).

src/common/steam/client_api.cpp (593) : ClientAPI_InitGlobalInstance: InternalAPI_Init_Internal failed, most likely because you are missing a 32-bit dependency of steamclient.so (the Steam client is a 32-bit app).

src/steamUI/SteamStartup.cpp (1028) : ! "There was a problem with your Steam installation.\n" "Please reinstall steam.\n"
src/steamUI/SteamStartup.cpp (1028) : ! "There was a problem with your Steam installation.\n" "Please reinstall steam.\n"
[2023-05-31 09:00:01] Shutdown

flathub / com.valvesoftware.Steam

Steam doesn't launch (crashes), "dlmopen steamclient.so failed: steamclient.so: failed to map segment from shared object" #1088