Not completely sure what causes it (some form of a thread overload when clicking??).
Video: https://youtu.be/zE07I7K_SQk
One way to reproduce: (probably the easiest)
Hold your jump and attack buttons down while against a wall.
MC-170855
Attacking while camera is moving causes player to jitter
Resolved
Duplicate
1
UserTeemu
(Unassigned)
Unconfirmed
(Unassigned)
camera, combat, rendering
20w06a
Retrieved
I've also had this jittering when attempting to hit blocks with a sword, while moving, in creative mode.