No additional ticks appear on the timeline when you zoom in

No additional ticks appear on the timeline when you zoom in

Regression: YES

Worked: 3172292 (4.13.2)
Broken: 3249277 (4.14.3)

1. Create a Third Person template project
2. Import the attached fbx onto the Mannequin skeleton
3. Open the animation
4. Zoom in on the timeline (mouse wheel)

Result: The timeline is not divided into more ticks up as you zoom in. Seems to be divided in an arbitrary manner.
Expected: Timeline keeps being divided down to ticks on the individual frame numbers as you zoom in.