I've been soft locked in the boss fight with the two Exile Leaders in the Fallen Caldera run.
It appears that the Fallen have realised that if their Health Bars are tied together, and one is immortal until the other loses a bar of health, that one of them can sacrifice themselves by doing a barrel roll off the cliff, taking their heath gates with them. Leaving the remaining Exile Leader to become permanently immortal.
Unless this bug is corrected, there is a possibility that this Exile Leader will rise the ranks, using their new found immortality to lay waste to civilisations across the universe. For the sake of Sol, they must be stopped.
Video is a low frames mess, but it shows there is no second Exile in the battle. The first one jumped off moments after they spawned in.