One of my vault dweller died in dinner, after I revived him my vault dwellers in dinner still complaining about dead body and smell and their happiness keep dropping to 20%

Is there anyway to solve this problem beside destroy it or build a new one( my dinner connect to other rooms and I don't have much caps) ?

My only suggestion is : Move everyone to living quarters (separate rooms if you don't want pregnant wemen.) the close app out compleatly. Reopen and place them back. This has worked for me.