Describe the bug
SteamVR can't connect to window manager. Happening on SteamOS stable branch and the latest Beta SteamOS 3.8.16

To Reproduce
Steps to reproduce the behavior:

1. Go to SteamOS Desktop Mode
2. Power on headset and controllers
3. Open 'SteamVR'
4. See error

Expected behavior
SteamVR opens correctly and I can play games.

System Information (please complete the following information):
Please use the latest Steam beta client and SteamVR beta for your bug reports!

• Steam client version (build number or date): 1785799196
• SteamVR version: 2.17.7
• Distribution (e.g. Ubuntu): SteamOS 3.8.16
• Steam runtime diagnostics: [generate via Help -> Steam Runtime Diagnostics in the Steam client]

steam-runtime-diagnostics.json

• Steam and SteamVR logs: [generate by running this command in a terminal tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]

steam-logs.tar.gz

• Minidumps: [run the following command: ``]

steam-minidumps.tar.gz

• Mesa Driver versions (I did not change these):

(deck@SteamMachine ~)$ glxinfo | grep "Mesa"
client glx vendor string: Mesa Project and SGI
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.3.0 (git-59b552c765)
OpenGL version string: 4.6 (Compatibility Profile) Mesa 25.3.0 (git-59b552c765)
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 25.3.0 (git-59b552c765)

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
I am using a PSVR2 with the latest versions of community drivers like the PSVR2 Toolkit and Ignition.
For my testing I used the Beta version of SteamVR and have tested both the unmodified official version of SteamVR and have tried applying some community "fixes". Both give the same result.

I have also tried using developer mode with the Legacy X11 desktop, but this one couldn't even open SteamVR properly.