Same problem here, I have currently the laptop in this state and can offer it for debugging for a week or so (offered on #snappy).
In journal there is this line:
snapd[755]: storehelpers.go:748: cannot refresh: snap has no updates available: "bare", "core20", "firefox", "gnome-3-38-2004", "gtk-common-themes", "snap-store", "snapd", "snapd-desktop-integration"
However some of the other snaps did update before that, but firefox is stuck.
Same problem here, I have currently the laptop in this state and can offer it for debugging for a week or so (offered on #snappy).
In journal there is this line: go:748: cannot refresh: snap has no updates available: "bare", "core20", "firefox", "gnome-3-38-2004", "gtk-common- themes" , "snap-store", "snapd", "snapd- desktop- integration"
snapd[755]: storehelpers.
However some of the other snaps did update before that, but firefox is stuck.