I recently built a blaze farm in the recent snap shot and realized that the blazes could track me through the wall. I first noticed this when I could hear blazes shooting at me out of my sight. After completing the farm, I replaced the walls with glass to see what was happening, and discovered many blazes just firing at me from behind the wall. This is happening after I attack 1 blaze, they all can track me through walls until they despawn. I don't think that is how their AI is supposed to work, though I could be wrong.