Removing the hamburger menu ( + not having a menubar ) in Dolphin causes its menu to show up in all sorts of contextual menus, annoyingly being the first item, shoving down all the other items and screwing with muscle memory if you decide you don't want the hamburger menu. The hamburger menu should stay out of the contextual menu, since it doesn't offer the contextual actions for this item I ask for when I press the button that says "I want contextual actions for this item."
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/kconfigwidgets/-/merge_requests/68