[SteamRT3] Not listing all native / local games/software in "add non-steam game" dialog

[tsr]

Your system information

• Steam client version (build number or date): 1783556394
• Distribution (e.g. Ubuntu): Gentoo Linux
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes
• GPU: AMD

Please describe your issue in as much detail as possible:

RESULTS
No games/software installed locally/natively in Linux (e.g. SuperTux2) are listed. Actually only software which is locally installed over non-steam (vanilla) wine and a few tools like XTerm which are in Steams sandbox.

EXPECTED
All games/software which is installed locally/natively in Linux will get listed, like it already works fine when SteamRT3-Client is not activated.

Steps for reproducing this issue:

1. Enable Experimental SteamRT3-Client
2. Select Add game
3. Select add non-steam game

[smcv]

This is a known issue (steamrt/tasks#995 internally). The steamrt3c runtime in the latest beta clients has some infrastructure work that might help to solve this, but Steam Client changes are also likely to be needed.