When holding right-click while having a trident in either the mainhand or offhand, the throwing or aiming animation causes the hand to rotate backwards.
This does not happen when holding a Shield or a Bow in another hand.
Trident arm postion
Trident Glitch in 1.16-pre 5
Arm position when throwing a trident is wrong.
When swapping tridents between hands, the trident being held doesn't swap visually, it just flips backwards
3rd person reverse trident bug
Trident animates backwards while eating
Player's arm goes backwards instead of upwards when shooting a trident
Drowned mob has no throwing animation