Effects with amplifier 255 act as level 1 on certain mobs

/summon snow_golem ~ ~ ~ {Pumpkin:1b,active_effects:[{id:"minecraft:regeneration",amplifier:255,duration:-1,show_particles:0b},{id:"minecraft:resistance",amplifier:255,duration:-1,show_particles:0b},{id:"minecraft:fire_resistance",amplifier:255,duration:-1,show_particles:0b},{id:"minecraft:health_boost",amplifier:255,duration:-1,show_particles:0b}]}