flatpak run com.valvesoftware.Steam output

output.log

$ flatpak run com.valvesoftware.Steam
INFO:root:https://github.com/flathub/com.valvesoftware.Steam/wiki
INFO:root:Will set XDG dirs prefix to /home/skenlon
INFO:root:Overriding TZ to Pacific/Auckland
Running Steam on org.freedesktop.platform 20.08.8 64-bit
STEAM_RUNTIME is enabled automatically
Pins up-to-date!
Steam client's requirements are satisfied
WARNING: Using default/fallback debugger launch
/home/skenlon/.local/share/Steam/ubuntu12_32/steam
[2021-05-06 18:28:57] Startup - updater built Apr 12 2021 18:51:36
Installing breakpad exception handler for appid(steam)/version(1618256785)
Looks like steam didn't shutdown cleanly, scheduling immediate update check
[2021-05-06 18:28:57] Loading cached metrics from disk (/home/skenlon/.local/share/Steam/package/steam_client_metrics.bin)
[2021-05-06 18:28:57] Using the following download hosts for Public, Realm steamglobal
[2021-05-06 18:28:57] 1. https://cdn.cloudflare.steamstatic.com, /client/, Realm 'steamglobal', weight was 100, source = 'update_hosts_cached.vdf'
[2021-05-06 18:28:57] 2. https://cdn.akamai.steamstatic.com, /client/, Realm 'steamglobal', weight was 100, source = 'update_hosts_cached.vdf'
[2021-05-06 18:28:57] 3. http://media.steampowered.com, /client/, Realm 'steamglobal', weight was 1, source = 'baked in'
src/tier0/threadtools.cpp (4044) : Assertion Failed: Probably deadlock or failure waiting for thread to initialize.
src/tier0/threadtools.cpp (4044) : Assertion Failed: Probably deadlock or failure waiting for thread to initialize.
Installing breakpad exception handler for appid(steam)/version(1618256785)
Installing breakpad exception handler for appid(steam)/version(1618256785)
[2021-05-06 18:28:57] Checking for update on startup
[2021-05-06 18:28:57] Checking for available updates...
[2021-05-06 18:28:57] Downloading manifest: https://cdn.cloudflare.steamstatic.com/client/steam_client_ubuntu12
crash_20210506182857_3.dmp[163]: Uploading dump (out-of-process)
/tmp/dumps/crash_20210506182857_3.dmp
Thread failed to initialize
src/tier0/threadtools.cpp (4044) : Assertion Failed: Probably deadlock or failure waiting for thread to initialize.
src/tier0/threadtools.cpp (4044) : Assertion Failed: Probably deadlock or failure waiting for thread to initialize.
Thread failed to initialize
CWorkThreadPool::StartWorkThread: Thread creation failed.

CWorkThreadPool::StartWorkThread: Thread creation failed.
Exiting on SPEW_ABORT
$ crash_20210506182857_3.dmp[163]: Finished uploading minidump (out-of-process): success = no
crash_20210506182857_3.dmp[163]: error: Couldn't connect to server
crash_20210506182857_3.dmp[163]: file ''/tmp/dumps/crash_20210506182857_3.dmp'', upload no: ''Couldn't connect to server''