Was playing around with guardians when an enderman picked up a grass block. The texture bug got my attention, then he walked into the water. After this, the enderman was dead-set on diving into that exact pond with the guardians in it. Seemed to be in aggro mode, not sure if his target was a guardian or the water.

I was in creative, so the guardians did not attack him by accident. I tested on other enderman in the pond after this, but none recreated the behavior.

EDIT: This is not a "no warp" duplicate. The enderman did warp every single time he hit the water, then ran straight back and dove in. Rinse and repeat. This happened far too many times without fail to have been chance.