Issue Summary

This is reproducible on Data Center: (yes).

If you remove the field due date from the edit screen, you still be able to edit the field in the Timeline (previous Roadmap) 

Steps to Reproduce

1. Create a screen without the Due date
2. Assign that screen to the edit and view screen 
3. In your workflow, create a transition with a screen and add the Due date to that screen
4. Add a condition in your transition to make a field required.
5. The field is not editable in the issue view
6. The users are still able to drag the issue in the Timeline and update the due date without the field required being filled.

Expected Results

The field is not edited in the edit screen, so the field due date should be manageable in the timeline 

Actual Results

Any user can edit the due date even if this is not on the edit screen.
Trying to prevent this by using workflow properties like jira.permission.scheduleissue.denied doesn't work because the due date stop appearing in the transition screen.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available