[GAMEPLAY] Yoricks ultimate removed from game if summoned inside of Mordekaiser's ultimate

This bug occurs when Yorick is ulted by Modekaiser and then summons his ultimate within Mordekaiser's ultimate. The issue occurs when both Yorick and his ultimate summon survive the duration of Mordekaiser's ultimate. Yorick's ultimate summon will not come with him back into the game but the cooldown with still behave as though it is in game. The only current work around I can find is to die in order to restart the cooldown for Yoricks ultimate. This is obviously less than ideal as a work around.

Steps to recreate:

​1. Mordekaiser uses their ultimate against Yorick 2. Yorick summons their ultimate inside Mordekaiser's ultimate 3. Mordekaiser's ultimate ends with both Yorick and his ultimate summon surviving

Expected Result: Yorick and his ultimate summon exit Mordekaiser's ultimate Actual Result: Yoricks ultimate summon no longer exists in game but the ability behaves as though it does with the cooldown timer not starting.