When the player throws a trident enchanted with loyalty onto a surface, the animation will appear to be inverted and clip through said surface leading to an unusual and unexpected look.

Steps to Reproduce:

1. Get a loyalty trident

   /give @s trident[enchantments={levels:{'loyalty':3}}]
   

2. Throw it at a flat transparent surface

   /fill ~ ~ ~ ~ ~5 ~5 barrier
   

Observed & Expected Results:

- The trident's pitch turns 180 degrees around before eventually returning to the player.
- The trident would curve in a reasonable arch upward before returning to the player.

Screenshots/Videos:

Minecraft 19w46b 2019-11-16 14-19-40_Trim (2).mp4

Original Description
by Devoider

The bug

When throwing a trident on a 19w46b server, the trident flies normally but after it sticks it then proceeds directly away from the player, then it appears back in the inventory. this is especially apparent when throwing the trident directly into glass. trident has loyalty 3 and mending on it.