When dying during the final encounter and retrying the phases get mixed up. Bossfor example uses all of his skills during each phase (fly phase, clone phase) making it impossible to proceed, on my second try ( i created new instance and i died at 3rd fly phase) the same issue, i died during the fly phase, i reentered trough the retry mote, and he was at 25% health in his last stage while a clone was bashing at me the entire time.
Also the jump pads for the fly phase are buggy and wont bring you into the air, then arent accessible a second time for a few seconds.
TL;DR The retry function mixes up phases and does not properly reset the fight. Jump pads are a bit buggy.