I was not able to find this issue reported.
The subpanel (e.g. for "Availability >"), shouldn't it close when the menu item is unhovered?
It is still open when you passed it beforehand and returned to hover another menu item, e.g. "Edit settings".
That feels wrong.

TO REPRODUCE

1. Go to https://qa.moodledemo.net/course/view.php?id=2 and activate editing mode.
2. Try the content menu for the "News forum" forum activity.