At one point while experimenting, I managed to delete my ‘personal’ calendar in the Nextcloud calendar app. It was recreated and is still labeled ‘personal’ in the app, but the caldav link shows it has actually been renamed to ‘personal-1’ as the underlying path. With just updating the caldav links in Thunderbird and such, synchronization is working again without problems. The only issue that remains, is that I can no longer accept calendar applications in the Nextcloud mail app. I assume it tries to save those to a calendar ‘personal’ by default and is now not finding this path in my account anymore?
Is there any way I can rename or recreate my personal calendar to have the internal path revert to ‘/personal’?