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