QWizard: Incorrect window height with a watermark

Create a QWizard object, set the style to ModernStyle, and set a watermark (say the height of the picture is 500px).
Add a page inside the QWizard whose sizeHint height is high (say 700px), but its minimumHeight is low (say 300px).

Expected to see:
The wizard height should be adjusted to the height of the watermark so that the watermark fits extacly in it's reserved space.

Got instead:
The QWizard window height is higher than the size required for the watermark.