You wouldn't see the trident if the trident was enchanted with riptide while holding a shield in the secondary slot in first person.

What I expected to happen was...:
I expected to see the trident in the main hand while the shield was off to the side during the riptide animation

What actually happened was...:
The shield was in the main hand instead of the trident

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...charge up a trident enchanted with riptide while holding a shield in the second slot
3. ...Release and the shield will be in the main hand instead of the trident