Newly added task lists are not shown

## What Happened

When I'm adding a new task list it does not show up in the Tasks app. Even though it is succesfully added to the Nextcloud backend via CalDAV. Also closing/reopening the Tasks app does not have any effect. Even forcing sync in Evolution does not make any difference.

The only thing that does work is to remove the whole CalDAV accounts from System Settings and re-adding it as a new one. Only then the new list appears.

## Expected Behavior

Adding and removing lists should be possible through the Tasks app without the need of re-adding the account through Online Accounts.

This used to work, so I'm wondering if we are dealing with a regression of some sort caused by either Online Accounts or the Flatpack packaging.

## Platform Information

elementary OS 6 stable.