The Bug:

Players' arms that are used to throw tridents naturally bob and follow the movement of players.

Just for clarification, "bob" refers to the natural swaying motion of the model parts. When using spyglasses, players' arms do not bob or follow the movement of players, therefore one would expect the same behavior to occur when preparing to throw tridents.

Steps to Reproduce:

1. Switch to creative mode and begin flying.
2. Obtain a trident, hold it, and prepare to throw it.
3. Without moving, observe if the arm used to throw the trident naturally bobs.
4. Begin flying through the air while still preparing to throw the trident.
5. Observe if the arm used to throw the trident follows the movement of your player.
6. Take note as to whether or not players' arms that are used to throw tridents naturally bob and follow the movement of players.

Observed Behavior:

Players' arms that are used to throw tridents naturally bob and follow the movement of players.

Expected Behavior:

Players' arms that are used to throw tridents would not naturally bob and would not follow the movement of players.