Aura mechanics doesn't support placeholders for Multiplier attribute

Summary

Aura mechanic ignores placeholders in the multiplier attribute. No matter what values I set there will be no effect

Steps to reproduce

1. Add it to mythicmobs skills yml file https://pastebin.com/TenDyKhT
2. Add it to MMOCore/skills/mythic-mobs/NameOfSkill yml file https://pastebin.com/TenDyKhT
3. Link this skill with any class
4. Use this skill and allow the mob to do damage to yourself

Server log file

https://pastebin.com/4mpGUrrw