Variable supercontrol with named ticks - go to the subcontrols panel, edit the subcontrols by dragging one to a new position - all existing names are overwritten with the labels of the subcontrols.
This is potentially a feature when the named ticks are vacant - populates the named ticks field with the subcontrol names. But not so much when you have entered other names.
ZD 3924, confirmed in beta 10.10.0 (202602141940)