stuck in a T15 map, cant exit boss arena

opened a t15 map, steaming springs with a boss
cleared half a map, entered the boss arena, killed the boss, but the game wont let me out of the arena


as in image
https://imgur.com/a/dYbqrZ8
boss is dead on the ground, arena has a red circular barrier. cant click on the "arena" exit, i can only portal back to hideout and attempt the map again