OS X Yosemite right button drag & drop works only every other time

• Enable right mouse button on Yosemite
• Launch Qt Puzzle example (qtbase/examples/widgets/draganddrop/puzzle)
• Drag and drop item using only the right mouse button

Expected is that every drag and drop action works as it works with left mouse button. But behavior is that only every other action works.

This is happening only on OS X 10.10 Yosemite.