CalDAV is stuck read-only / grayed out from new event calendar choice
CalDAV is stuck read-only in GNOME calendar on my PinePhone (with Mobian/based on Debian ARM64), with the CalDAV calendar entry grayed out from new event dialog's calendar selection. This greatly diminishes the usability, because I need to make a local event in the local offline calendar rather than the CalDAV one, and then once home at my computer, look it up on my phone and manually recreate it in Thunderbird to move it into the actual online calendar. Since any changes of the CalDAV calendar from elsewhere show up in GNOME calendar on my phone immediately, clearly the calendar is otherwise connected just fine. I just can't actually actively use it, just kind of passively get it synced which isn't very practical.
If you need any debug logs, I'd be happy to see if I can provide them.