Timeline playhead doesn't update on interval change

[markacianfrani]

Describe the bug
The Timeline playhead doesn't update when you change the interval.

To Reproduce

https://codepen.io/rocketmark/pen/zYyVrjd

1. Click days radio, which sets the Timeline interval to day

Current behavior
The playhead does not move

Expected behavior
The playhead should move in relation to the change in the ruler. For example, if you click day, and then change the zoom, the playhead will move to its expected spot.

Additional context
Probably just a missing watch somewhere