Plugin integration - EntityRegainHealthEvent not called on Mythic mob healing

Hello, I'm working on integrating my plugin HealthBar-Reloaded with MythicMobs and I've run into a small issue with the "heal" skill. When the Mythic mob is healed, the EntityRegainHealthEvent is not fired. This prevents my plugin (and any others) from detecting the health change due to the skill and updating it correctly. Would it be possible to have this event triggered whenever a mob regains health?

Minecraft: 1.21.4 / MythicMobs (free) version: 5.9.5

ExampleMobs.yml configuration:

SkeletonKing:
  Type: WITHER_SKELETON
  Display: '&6Skeleton King'
  Health: 20
  Damage: 1
  Skills:
  - skill{s=SummonSkeletons} @self 0.1
  - heal{amount=50} @self ~onDamaged <50%
  Equipment:
  - IRON_HELMET HEAD
  Drops:
  - GOLD_NUGGET{display="Gold Coin"} 1to2 0.5
  Options:
    AlwaysShowName: true
    MovementSpeed: 0.2
    MaxCombatDistance: 25
    PreventOtherDrops: true

Mythic mob spawned with: /mythicmobs mobs spawn SkeletonKing