Wolves and dogs have always been able to attack skeletons as long as some part of them was visible but now they cant attack them in these situations.
see image.
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Can confirm that the above way of farming skeletons have always worked. I've used this setup for years, and now it's no longer working. I can understand that mobs need their "eyes" to see things for the AI to kick in, but for wolves to need to see the skeleton's "eyes" in order to attack just seems unnecessary.
Duplicates/relates to MC-144763.
As far as the game AI is concerned, you have two full blocks and the skeleton is inside them