[2022] Completed Daughter of Lerion Cordelia, but game acts as though it is still active?

I beat Cordelia in Berkelow Bog and got her dagger but battlefield remains active and her body is laying on the ground (game acts as though you are running away when leaving the area). The Daughter of Lerion icon remains on map. Have completed the other daughters of Lerion, and they no longer show as icons on the map. I have even gone and raided the ruined mansion, putting all three daggers in the statue, and completed that. East Anglia summary shows that one mystery is yet to be found/completed. Game is up to date, on PC. Clearly is a glitch, is there anything to be done to resolve this? I am not going back to an earlier save, when all the game needs to do is flag the quest as completed.