Unable to move task to another list

[tenebrisnox]

Describe the bug
When I try to move an already-existing task in an already-existing list to another already-existing list it fails to move.
(eg. When I try to move a task from my "Next Week" list to "This Week" it temporarily disappears and then remains in the list. It gives an "Oops! Something happened" error.)

To Reproduce
Steps to reproduce the behavior:

1. Click on task item
2. Click on 'MOVE' option
3. Choose list to move item to (in my case Next Week to This Week)
4. Error "Opps! Something happened appeared"

Expected behavior
Task item moves from current list to another existing list.

Screenshots

Desktop (please complete the following information):

• Ubuntu
• 24.04.1 LTS
• Gnome

Additional context
I'm using Planify 4.11.6. I use Nextcloud CalDAV to maintain tasks across devices. (This action works if I do the same thing in the iOS Reminders app - so I don't think it has to do with my Nextcloud setup.)