[GAMEPLAY] Mordekaiser can't control Azir's ghost

I've had this bug occur a few times now over the last few months, and I've only just now noticed that it was always Azir's ghost that refused to move. It didn't matter if I killed him instantly with my ult when he was low life, or if he died slowly from it, or if he was ignited or killed by any other ability.

No matter how Azir died while my ult was on him, his ghost would refuse to move. I alt-left clicked, I pressed R, I even clicked my ult button to try to move him, and he didn't respond to anything. He auto-follows me still, and he attacks things that attack me when they're close enough, but that's it. Every other champion ghost responds to my commands, even when in games with Azir.