The bug
Players in creative mode frighten armadillos and it causes them to roll up into a ball. This is inconsistent with other mobs which are scared of players. Stray cats, ocelots, and rabbits are scared of players normally, but ignore players in creative mode.
Steps to reproduce:
Spawn Armadillos
Sprint near them in creative mode (even sprint flying scares them)
Observe they are frightened by the player ❌
Expected result
✔ They would not be frightened by players in creative mode
Observed result
❌ They are frightened by players in creative mode
Confirmed!