Couldn't damage or progress Black Crow boss in Blooming Fields map

Bug Report ID: #380064656

I entered the Black Crow boss arena and fought it as normal. After doing enough damage for it to move into the next area I continued to damage is as it was running away. Upon reaching the "bell" area, the fight continued as expected. Enough damage was done to advance to the "bell" phase. Black Crow began moving towards the bell and I heavy stunned it before it could pick up the bell. It did not attempt to grab the bell again after the heavy stun. Afterwards I was able to continue damaging it until it had approximately 10% of it's health left, then I could not do any damage to it and was stuck in the boss arena with a very angry and immortal Black Crow.