Open Media manager -> Images -> choose some image for edit -> assign some category if none is assigned yet -> remove assigned category -> open categories dropdown and search for removed from assignments category: it won't be available in the list.
Issue exists only in images/files properties edit, in all other pages list is updated correct and category for selection is available as soon as it is removed from assignments.
Open Media manager -> Images -> choose some image for edit -> assign some category if none is assigned yet -> remove assigned category -> open categories dropdown and search for removed from assignments category: it won't be available in the list. Issue exists only in images/files properties edit, in all other pages list is updated correct and category for selection is available as soon as it is removed from assignments.