Since guardians and elder guardians are mostly ignored like any other mobs, they have broken animations as of 188.8.131.52 Beta. Details are shown below:
*Spikes don't retract when swimming.
*Tail seems to be jittering from whether it should move fast or slow.
*Spikes have a weird glitchy retract and expand animations on land.
*Tail sways very slow when they are flopping.
Guardians have a weird vertical rotation, the rotation has been changed in 184.108.40.206 Beta. They now rotate in a top arc clockwise when vertically rotation to attack a player/squid, they rotate in a bottom arc clockwise vertically. The laser beam becomes offset, and half of the guardian's body is clipping through a wall.