Zombified Piglins, unlike other mobs that are neutral until attacked (iron golems, endermen, llamas, etc, etc), will agro towards players in spectator and creative mode.

To recreate:
1. Attack Zombified Piglin in survival mode
2. Enter creative/spectator mode

Edit: previous directions dont work. I cannot find a reliable method to recreate this but if you spawn a long line of Zombie Piglins, attack one, and go into creative, one will agro the rest and all will try to attack you in creative and spectator