Phone - Android - Samsung J3,
Also confirmed on HTC One M8.

In creative mode when an endermite is spawned using a spawn egg, periodically the endermite spins around for a couple of seconds.

Steps to recreate:
In a creative world.
1. Spawn an endermite.
2. Observe it stopping and spinning around for a few seconds every now and then.

Bug found and vidcapped JackTheMoveBoy10
Not tested on a clean survival mode world.

Edit by SuperGeniusZeb:
This bug occurs when endermites use the "minecraft:behavior.look_at_player" or "minecraft:behavior.random_look_around" components. I believe it happens because the endermite is constantly in an idle animation, and using these behaviors causes it to try and do 2 different animations simultaneously. This bug can be fixed by simply removing these behaviors from the endermite.json file in the vanilla behavior pack.