Scrollbar handle image is not display at the right place when handle smaller than image

Since I compiled my projet with Qt 5.4.0 beta, when my scrollbar handles are very small, the inside image is not display at the right place, it's at the top left of the scrollbar.

This is a regression from Qt 5.3.2, in previous build the image is simply not displayed at all if the handle is smaller than the image.