onHit doesn't work

Hello, I would like to let you know that the onHit option doesn't work, I used this example:

IceShield:
  Cooldown: 0
  Skills:
  - orbital{onTick=IceShield-Tick;onHit=IceShield-Hit;points=20;interval=1;duration=200;charges=1} @self
IceShield-Tick:
  Cooldown: 0
  Skills:
  - effect:particles{p=snowballpoof;amount=20;speed=0;hS=0.2;vS=0.2} @origin
IceShield-Hit:
  Cooldown: 0
  Skills:
  - damage{a=10}
  - potion{type=SLOW;duration=100;lvl=2}

after touching the mob it should take 10 hp but nothing happens with the projectile mechanics, I also tried the same result

Tested on version server 1.16.4 mythicmobs 4.10.1

and server 1.15 mythicmobs 1.15