Crash when connecting KeePassXC-Browser addon in Firefox snap

[mattsches]

Ubuntu 22.10, Gnome 43.1, X11, Firefox 108 snap

In Firefox, I try to connect my KeePassXC using the corresponding Firefox addon, but when I initiate a key exchange, xdg-desktop-portal crashes. When I start it manually, I get the following output:

$ /usr/libexec/xdg-desktop-portal

    # ==trying to connect to KeePassXC here== #

(/usr/libexec/xdg-desktop-portal:530488): GLib-GIO-CRITICAL **: 16:17:04.738: g_app_info_get_id: assertion 'G_IS_APP_INFO (appinfo)' failed

(/usr/libexec/xdg-desktop-portal:530488): GLib-CRITICAL **: 16:17:04.738: g_strsplit: assertion 'string != NULL' failed
Speicherzugriffsfehler (Speicherabzug geschrieben)

I've given it the following permission
flatpak permission-set webextensions org.keepassxc.keepassxc_browser snap.firefox yes

It used to work after I upgraded to Ubuntu 22.10, and it probably works after reboot for a certain time (will try if that helps) - until it crashes for some reason.

Let me know if I can provide any additional info …