[GamePlay] Game breaking Yorick Bug

Yorick has the ability to cast invulnerable ghouls. It single handedly won the game for the other team. I'm not sure but it occurred when I was playing Rengar in ARAM and I tier 2 Bola'd (the net that locks champions or monsters in place) the ghoul then it created an invulnerable ghoul. This needs to be addressed immediately.