The Silent Cave Bug

Did the silent cave unique map the first time and i killed every mod/boss, then went to the middle and killed the main boss, but the map objective still says "Defeat The Imprisoned Boss". Also first time reporting a bug so not sure i did it correct



https://1drv.ms/i/c/d35c1405d4003dc3/EU9bwqOVLqxGpHceBT82IRABF7dBXjtfdln7anHwTRBNhg?e=tB2DJU