OpenSuSE Leap 42.2 kwin problems with plastik decoration theme

Are there still known problems with kwin_x11 and plastik decoration theme? Our administration is testing opensuse leap42.2 and one special java application shows an empty window the contents of which is only fully visible when a “mouse over” the window is done. The application starts with a white window. Normal java applications like freeplane work fine without any effects. It looks like a caching problem. Switching to a breeze theme of kwin solves the problem. Very strange! We’ve never hat such problems with kde3.5.
Shall I file a bug?