[GAMEPLAY] Mordekaisers Ghost Dragon disappears immediately

I hit the dragon with my auto attack and skills to curse the dragon with my ult passive. My team get the dragon and the ghost was summon for a moment I used my ult right click to attack quinn with my dragon but my regular ult was used against her We kill quinn and i got her ghost

I try this on practice tool with dummy enemy but didnt happen

Update: https://www.youtube.com/watch?v=mXbnREvlxpw sorry for the low quality its kinda hard to see

during the pause it shows my team secures the dragon and the ghost appears my ult gets replace to command dragon quinn dont have my ult

but when i continue the clip my regular ult was used against the quinn (mordekaiser has a special laugh voice for his ult) my ghost dragon is still alive my ult is still command skill

and then my dragon dies because of quinn dies and her ghost appears

so the problem is mordekaiser can use his regular ult for a fraction of time after the dragon dies even with the command icon on his ult and ghost dragon still there