Assessment mode: Element restriction - boxes get unchecked when a structure element is open

in the element selection window, when only some elements are checked, the parent element gets the - mark, meaning only some children are selected.
If a structure element is open though, the partial marker disappears from the course node, and the now open structure (parent) element won't get the partial marker either.
This is confusing for users, and even though the elements are displayed correctly in the assessment setting, it would be good if the markers were all placed correspondingly