In Arch Linux (SteamOS) flatpak version, "Open folder in explorer" button does nothing

[omgitsraven]

I just switched from the website-download version of the Itch linux app, to the Flatpak version (in order to get back the ability to install Windows games), and everything seems great except for one thing: trying to get the app to open a folder does nothing. This happens (or rather, fails to) with either of the following routes:

• Library > click game thumbnail > gear button > manage > "Open folder in explorer"
• Library > right-click game thumbnail > "show in file manager"

This is inconvenient because that's normally how I'd reach the executable in order to right click it and do "add to steam" to use it from the Steam Deck game mode launcher.

I'm running itch @ 26.1.9 on Steam OS 3.5.19