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`SliderSelectionBlueprint.OnDeselected()` would expire the `ControlPointVisualiser` on deselection, leading to its removal from the blueprint and eventual disposal, but still kept a separate reference to said visualiser in another field. This could lead to that stale reference to a disposed child getting read in `ReceivePositionalInputAt()`, crashing quite a ways down over at the framework side on futilely trying to compute the bounding box of a drawable with no parent.