Tried to do a village raid in a multiplayer MCPE 1.19.10 realm world. After defeating all the enemies in one phase the raid bar at the top of the screen stated that there was still one mob remaining. However neither me nor the other player could find the remaining mob after 40 minutes and the raid eventually expired. This has happened twice now. After both occurrences I told my friend to leave and I did a raid in single player and this problem didn't  happen and I was able to complete the raid. This was all done on a Realms Plus survival realm.