Phantoms do not rise when spawned near a cat.
Steps to Reproduce:
Spawn a cat
Spawn a phantom near the cat
Observed Results:
The phantom does not fly away from the cat and just stays on the same Y level.
Expected Results:
The phantom should fly up and away from the cat.
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This behavior is caused by the fact that phantoms try to avoid getting within 16 blocks of cats, but they are not able to select pathfinding targets that far away, so when spawned near a cat they cannot find a block to path to.
When spawned next to a cat, phantoms move away horizontally for 5-6 blocks and then try to turn upward, but then immediately turn around. The do this even if spawned next to cat that is sitting on a pillar 20 blocks above the ground, or one suspended in the air by a repeating teleport command. The phantom turns around instead of flying up because every block they can scan above them is still within 16 blocks of the cat. It's analogous to MCPE-101670.