Terrace Map Boss froze up

I was running terrace and got to the boss(Yugul). I down it to 2/3 of it's life, where it would normally enter a silver pool and summon it's copies, but instead it froze in place and it's invulnerable. The rest of the arena keeps working as usual, it's just the boss that stopped.

Bug reference 20.140.319

Same thing just happened to me. Portal to hideout and and coming back fixed it.