Audible notifications sometimes happens without highlighting room and adding item to Notifications sidebar

### Description

I have enabled the `Enable audible notifications for this session` and sometimes (fairly often) I receive the audible notification from Element, but none of rooms becomes highlighted (red-colored), also in current and in "Notifications" sidebar there are no new entries too... And there is no highlighted message in currently selected room too, and no notification in system notifications.

So I'm very disoriented about what is happens, and who triggers this audible event.

Can anybody describe how to figure-out which room and event can cause this notification, to improve this bug report?