Tridents instantaneously face downwards when beginning to fall

Discovered while testing MC-164001.

The bug

When a trident stops ascending and starts descending, it can appear to face straight down for a matter of frames while turning.

How to reproduce

1. Hook up a 21-tick repeater clock to an upward facing sticky piston with two slime blocks on top
2. Fire a trident into the top slime block
3. Activate the clock
4. Observe after a while

Expected results

Smooth trident rotation.

Actual results

For an instant at a time during its apex, it flicks into a position facing straight downwards.