Maven Bugged Arena

I tried maven today in the Necro Settlers leauge the first two phases went as it should,but at the second mob summoning stage maven spawned two bear bosses that makes walls and runs to you now they were behind eachother made walls then the brain swapped bosses and the walls stayed in the arena in an invisible state maven bugged into the wall and only the fireball and the memory phase dealt damage to my char.I have OBS recording about it.
https://youtu.be/qSKXGmbj4lI
Youtube is still doin the vid its only 144p now

Seconding this issue. Invisible walls appeared in the arena and I lost my invitation. I'm too scared to try again and waste another divine on it.