In QML, adding Behavior to width and height does nothing if item is anchored

There is an inconsistency, if one adds Behavior to width or height properties, it will only work if the 'width' and 'height' properties are directly changed. If such properties change due to anchorage, Behavior is ignored.

In the attached example (run with qmlviewer), the inner (yellow) rectangle follows the size of the outter (green) rectangle. Resize the window to see it animating. However, try commenting out "TEST 1" and un-commenting "TEST 2" and it won't work anymore.

I understand that anchors and width binging may be handled in different ways internally, but IMO this is inconsistent..