Mirror Image Issue

[JFAMAP]

Hello everyone. I have a major issue with this spell. One of my maps includes spells based Mirror Image. But when we cast Mirror Image, casting unit no more detecting by trigger.
Then i created trigger like this but still not working.

This trigger works well UNTIL this hero casts Mirror Image.

• Gatotsu First Stance Setup
  • Events
    • Unit - A unit Learns a skill
  • Conditions
    • (Learned Hero Skill) Equal to Gatotsu First Stance //
  • Actions
    • Set GatotsuFirstStanceUnit = (Triggering unit)

• Gatotsu First Stance Run
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Gatotsu First Stance //
  • Actions
    • Trigger - Run Gatotsu First Stance Effect <gen> (checking conditions)
    • Unit - Add Gatotsu First Stance // spellbook to GatotsuFirstStanceUnit
    • Player - Disable Gatotsu First Stance // spellbook for (Owner of GatotsuFirstStanceUnit)
    • Wait 4.00 game-time seconds
    • Unit - Remove Gatotsu First Stance // spellbook from GatotsuFirstStanceUnit

How can i solve this?