When dragging the bounding box gizmo and then simultaneously clicking right mouse button once, the drag will still go on even after releasing the left mouse button.
PG: https://playground.babylonjs.com/#851PUZ#24
Toggling gizmoManager.boundingBoxGizmoEnabled still makes it so once you start dragging the gizmo again, it will still go on even after releasing.
Tagging @Cedric