WheelHandler enables itself although deactivated

In this code, a WheelHandler shall be deactivated as long as the DragHandler is active. While the enabled property is correctly set to false when the drag starts, it is magically re-enabled once the wheel has been used.

How the example code produces the wrong behavior:
1. Start dragging the purple rectangle (this disables the WheelHandler).
2. While still dragging, move the mouse wheel.

Expected: The WheelHandler does nothing, because it is disabled. The wheel signal should not be sent.
Is: The WheelHandler is somehow enabled again and the wheel signal fired.

The issue does not occur when using a static "enabled: false" in the WheelHandler, so I suspect that the point in time is crucial here.

Please find a working minimal example in the attachment.

WheelHandler {
    id: wheelHandler
    enabled: !dragHandler.active
    target: null
    onWheel: appWin.scaleFactor += event.angleDelta.y / 1000
    onEnabledChanged: console.log('WheelHandler enabled', wheelHandler.enabled)
}

DragHandler {
    id: dragHandler
    target: sampleRect
    onActiveChanged: console.log('DragHandler active', dragHandler.active)
}