The crowbell bug

Just now I was fighting the crowbell and it had 3 phases. But in the second phase, my dps was too high that its hp dropped to around 10% and locked. I can not do any more damage to it and it's also not going to get the bell, open the door and turn into the final phase. After it beat me for 2 mins I let it kill me and my second try on it turned out the same bug. So I have to quit the game to try another map because during a boss fight I can't teleport to my hideout. I think it's fine to freeze the boss's hp when players first time fighting the boss. So that they can experience the full process and performance of this boss. But in the end game stage, we will fight this boss thousands of times and I think it is fine to just let us kill it in a few seconds. The crowbell is a very designed boss and I really like it. But it is also the most time-consuming boss that normally takes 3-5 times of time to kill it compared to other bosses. Hope my point of view is helpful.