I've noticed some odd behavior around the Time Tracking fields.
1) In a Kanban Project
2) Field is enabled and listed in the particular screen
3) Time Tracking field shows (when populated) in Classic > Edit form
4) Time Tracking field shows (when populated) in New page but ONLY if it's in the main Tab. If I try to put Time Tracking in a custom secondary tab, it goes MIA.
Since there doesn't appear to be an EDIT button in the new View, I basically lose access to the field unless I revert to classic view.
After thinking about this more, I think it's because I'm using Tempo for time tracking so maybe it absorbs that field into it's own widget?