(copypaste from a pm on spigotmc, I don't know if this is the right place to ask for help but seems a pretty strange issue)

Hello there, I'm having some troubles with a custom mob I made, it doesn't cast the spell I want him to.

here's the spell (working normally, with a wand)

MFire:
actions:
cast:
- class: CustomProjectile
actions:
- class: Disc
actions:
- class: Cover
actions:
- class: Burn
parameters:
velocity: 80
target_type: LivingEntity
allow_max_range: true
range: 48
hitbox: true
fov: 0.03
radius: 0
vertical_range: 4
undo: 1000
target_breakables: 0
destructible: burnable

here's the mob (everything else behaves normally)

roasty:
chestplate: ""
leggings: ""
helmet: ""
boots: ""
item: ""
name: "roasty"
type: husk
health: 8
default_drops: false
drops:

• exp_bottle@2
  attributes:
  generic_follow_range: 30
  cast_interval: 1200
  cast:
  MFire: 1
  potion_effects:
• type: fire_resistence
  amplifier: 1
  disguise:
  type: blaze

I just tried this out and it worked for me- the only issue being I had to go hit the husk before he'd attack. Magic mobs will only cast spells when they are aggressive, little odd this husk didn't get aggressive with me near but I think that's a vanilla thing.

If you walk up and hit the husk, does he then cast the spell ok?

it doesn't cast any spell even if I hit him, but normal melee-attacks from him do work.
It should also be disguised as a blaze...

I don't have protocol lib or libsdisguises on my dev server, so it looked like a husk.

I copied your configs directly and it seemed to work. Not sure what else I can do, sorry! :(

Wait, just tried it out in another world, seems to work fine in here, probably was a multiverse thing.
Thank you so much for the support, could you please respond to a question I asked on spigotmc? It is about
collateral damage from spells that you cast, Don't think I should open a ticket in here