Neutral mobs can attack players in creative mode if their NBT is updated every tick

1. Enter the following command into a powered, repeating command block.

execute as @e[type=minecraft:iron_golem] run data merge entity @s {PersistenceRequired:1b,Attributes:[{Name:generic.follow_range,Base:100}]}

2. Switch to survival mode and attack the Neutral mob

3. Change to Creative mode

relates to MC-146524, MC-153697, MC-165448