Kuva Lich bug: invisible for you but visibile for other players

[LookDontTouch]

So like everyone in warframe i had to kill a Kuva lich, he was in stage 4, me and my friend made him to fall down so i can yk kill him, i pressed X, it showed me the animation of him getting killed  but he didn't died, he was bugged into a wall showing to my friend that he is still there but for me was  invisibile.My friend  was telling me he was on the ground but  i couldn't see him and now it show's me that he's still alive and my progress from the last mission is unknown it's like i didn't even made the mission.

[LookDontTouch]

I coulnd't even press X i was just seeing the icon that the Kuva lich was there but i could't do anything :')