What I expected to happen was for the Ocelots to ignore the Chickens, since they weren't in its line of sight.
What did happen is that the Ocelots began to crowd up against the corner wall, attempting to kill the chickens.
To reproduce this AI misbehavior, Make a wall of sorts similar to what is shown in the image, then spawn Chickens on one side, then Ocelots.
This also seem to affect Llamas, and Wolves
Wolves, and Skeletons
Wolves, and Rabbits
Wolves, and Sheep
Villagers, and Zombies
Villagers, and Evokers (Not Vindicators however?)
Iron Golems, and Evokers
Relates to MC-110390 & MC-101424.