Repro:
1. Pick any hero and get Manta Style
2. Create an enemy Enchantress and level up Enchant
3. Cast Manta Style
4. Cast Enchant on one of the illusions
5. Cast Manta Style again

Result: The Manta illusion is not destroyed if it is not under your control. If you steal it back with Enchant (doable with Rubick, or in same hero modes), it does get destroyed on recast.

Expected: The manta illus should always get destroyed on recast, no matter who owns them currently. This works fine with Mirror Image of Naga and CK's Phantasm.