The hover effect is controlled in JavaScript, and has a delay on toggling (by design). The hover off is triggered when you hover over another menu item, but not when you hover outside the menu.
That means that if you quickly hover over a few items, then move your mouse outside the menu drawer, the hovered items will stay hovered.
This blocks arrow movement, unless you press arrow left to "dismiss" the (hidden) popover.
There's also reports of a JavaScript error.
[Error] TypeError: undefined is not an object (evaluating 'focusableElements[focusedIndex-1].focus') (anonymous function) (js_Ez2GMQcuGAO5zipRlKWSB0V0jT7lLqDrF3Fi0L4o6dY.js:1970:3557)
Closed: outdated
1.0
Code
It affects the ability of people with disabilities or special needs (such as blindness or color-blindness) to use Drupal.
Fixed by https://www.drupal.org/project/navigation/issues/3436130 📌 Ensure keyboard navigation works with the drawer Active