Steps to reproduce:
0. Switch to Today's view
1. Create Task A for today without tag -> Task A is added
2. Create Task B for today without tag -> Task B is added
3. Create Task C for today with tag tag-a -> Task C is added
4. Enable a tag filet: "Untagged" -> Task A and Task B are shown
5. Drag the Task A to Next -> Task B and Task C are shown (filter has been reset)

Actual behavior: Filter is reset to state 'All'. Task B and Task C are shown.
Expacted behavior: Filter should stay active. Only Task B should be displayed

Hope the issue is clear.

Thanks.