The bug:

You can use a riptide trident without reducing its durability.

How to reproduce:

1. Enchant a trident with any level of Riptide, I used Riptide 3
2. Stand in a waterlogged bottom slab (it is easiest to place 4 bottom slabs around the waterlogged one to stop the water from flowing, but this still works in flowing water)
3. Hold down right click to fully pull back the trident
4. Jump and immediately release right click

Result:

The trident does not lose durability, show particles, or make a sound/subtitle, but you can still fly with it.

Notes:

• This works ever since 1.13
• This has to be timed almost perfectly to work
• You can travel just as far as a normal trident throw