I'm not quite able to reproduce it intentionally/controlled.

Steps to Reproduce:

Be in Creative

Have zombies around you while you hover less than a block over the ground

Observed Results:

A  zombie turns towards you and once it is in range, the arms move as if it was attacking the player.

Expected Results:

The zombie stays passive and ignores you.

Notes:

While I was flying around during the night, I was killing the mobs around me, and I would go idle for a few seconds and a nearby zombie would turn towards me and attack. It doesn't push you or actually hurt you if you change to survival afterwards. Right after it hits you  it returns to being passive as normal. I could not get a picture because it does not always happen.  (nearby the area was 4 zombie spawners and lots of heads as well. It was  the mountains biome. I do not know if that might of caused it or not) It is only a minor bug and does not severely impact gameplay.