If a mob is riding another mob, say a villager riding another villager, the ridden villager is able to turn its head 180 degrees. See attached images.
To reproduce, summon an entity with another one riding it and go behind the ridden entity and wait for it to look at you.
I have not tested all mob combinations for which shows this behaviour or not.
Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MC-181435, as that ticket contains more detailed information and/or has already been triaged by Mojang.
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