SelfSteam has been released in version v0.1.35.

SelfSteam is a headless web application for adding and editing non-Steam shortcuts from another device while the target machine stays in Game Mode. The tool ships as a Flatpak for the Steam Deck and Steam Machines.

After version 0.1.34, the update fixes issues on SteamOS 3.9: the code screen and the “Restarting Steam…” screen work again. Reinstalling also adds the Steam shortcut again.

The code screen and the “Restarting Steam…” screen work again on SteamOS 3.9, which dropped a text library they used

Reinstalling SelfSteam now adds its Steam shortcut again

Source: GitHub