Vaal Ruins Room Bugged\Glitched

Recently encountered a glitch with Zoltec, High Priest boss in one of the Vall Ruins room. It entered a rare monster fight in another room. Then buries itself and becomes invulnerable. The problem is that the monster never pops out again thus preventing me from completing the room AND the temple run. https://imgur.com/a/otoUImC.

Any help on how to unglitch this flitch?