I have a Server Side mod made using only the functions built into DayZ. No mods, frameworks or libraries are used.
It just happens that when using the built-in function NotificationSystem.SendNotificationToPlayerExtended notifications remain and do not disappear. Perhaps it worked properly before or no problems were found in it, and now I find it and it creates discomfort. I have to restart the game to make the notifications disappear.

for example:

message = string.Format("Доступные авто: ada, olga, gunter, sarka, m1025, m3s");
NotificationSystem.SendNotificationToPlayerExtended(player, 5.0, "Сервер", message, "set:dayz_inventory image:wheel");