Incompatible Version Bug: Math not Working

[MooshroomStatus]

Enter a brief description of what is broken Math not Working

What version of Minecraft are you using? 1.14

What server jar are you using? Spigot

What is this a bug report for? MythicMobs

What version of the plugin are you using? 4.7.2

Describe the bug. Be as specific as possible, images or short gifs/videos are welcome but save configuration files for later sections. Write a whole paragraph if needed, help us bug testers replicate your issue!
Using math for Damage or Heal doesn't seem to do anything. Damage and Heal values default to 1.

Example Configurations

CSC:
  Type: HUSK
  Display: '&5CSC'
  Health: 100
  BossBar:
    Enabled: true
    Type: SOLID
    Title: '&5&lCSC'
    Color: PURPLE
  Options:
    MovementSpeed: 0.01
    PreventOtherDrops: true
    PreventRandomEquipment: true
    PreventItemPickup: true
    Silent: true
    KnockbackResistance: 1
  Skills:
  - damage{amount='5+5';ia=true} @Target ~onDamaged
  - heal{amount='5+5'} @Self ~onInteract

 

[iTzCascadexX]

Math is Premium only. I also believe it was added in 4.8.

 

[MooshroomStatus]

It's worked before. It was updated and fixed in 4.8, but it was introduced in 4.7.0 for Damage and Heal mechanics.

Edit: I see now that it's premium only. I thought at the time, it was permanently added for those few mechanics only when 4.7.0 was free. Nevermind then.