Zoom in sample editor broken?

When zooming in the waveform in the sample Editor the waveform disappears when the zoom factor gets smaller than 1. The value can be further decreased to 0.05, but the wave is gone. Zoom in other Windows like Project window works fine. Is anyone experiencing this, too and is there a solution?

It’s the same for Cubase Pro 8 and 8.5
My machine is Win10 64bit, i7 8GB, running Cubase Pro 32bit app