Flatpak apps cannot launch web links (via firefox) or other apps e.g. gwenview

Discord is a flatpak app, and when I click a link, e.g. a github issue - it prompts for confirmation and when I confirm - nothing happens.

Similarly with other flatpak apps, e.g. Thunderbird. I am trying to open a picture attachment off an email, I select Gwenview as the app to do it in Thunderbirds "open with" selector and nothing happens.

Thunderbird also failed opening the file selector dialog when I wanted to attach a file to a new email, but this solved it - https://github.com/ublue-os/bazzite/issues/196

I rebased to Bazzite from Kinoite. It worked under Kinoite.

Does anyone know what can be inspected or what I should set to get it working?
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