The riptide attack animation continues to play even if you are stationary on the ground, despite the animation implying movement.
Steps to Reproduce:
Get a riptide trident
/give @p trident{Enchantments:[{id:"minecraft:riptide",lvl:3s}]} 1
Look directly down
Use the trident
Look forward and/or upward
Screenshots/Videos:
[media]
Notes:
This issue is likely working as intended based off of the resolution of MC-267296.
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Hi there!
I can confirm.
Hi!
I can confirm for 20w46a.
Can confirm in 20w51a.
Can confirm in 21w03a.

Doing an action that causes you to change your player animation (eating, swimming, loading bow or crossbow, using elytra) causes it to update your animation and put you back to normal.
Hard to reproduce. If anyone knows how please comment.

Relates to MC-90026?
(Similar player animation bug)
Requesting ownership of this issue as @unknown has not updated this issue since 1.16.4, and the video attached leads nowhere.