Deck task lists still showing after disabling them

[Nico7as]

Describe the bug In Nextcloud, we can opt to have de Deck tasks shown in the Task app. I enable it, the Deck tasks appeared in Planify (read only) I disable it, the Deck tasks are still showing in planify. The're absent in Nextcloud's Tasks.

To Reproduce Steps to reproduce the behavior:

1. In Nextcloud : go to your Deck App, in Settings, tick the box "Show board in calender/tasks"
2. Got to your Tasks App to check
3. In Planify : Refresh your CalDav / Nextcloud Task list. The task lists should appear, with the prefix Deck:
4. Go back to Nextcloud Deck, untick.
5. Go back to Nextcloud Tasks, check they're not showing anymore
6. In Planify : Refresh. The Deck Tasks are still showing.

Expected behavior They should disappear after refreshing/synchronising.

Desktop (please complete the following information):

• OS or DE: Fedora 39 - Gnome 45
• Planify 4.6 Flatpak

[janvlug]

I noticed the following: If you right click on a regular task in Planify, a Refresh option appears in the pop-up menu. If you right click on a Deck task, there is no Refresh option in the pop-up menu. I have the feeling that the Desk tasks that I see somehow lost the connection with Nextcloud, now that in Nextcloud I have the "Show boards in calendar/tasks" option disabled.

What should happen with tasks lists that lost the connection to the Nextcloud back-end? Should the loss of connection somehow be indicated? Should the be locally deleted (after user confirmation)? Should they be hidden?