SwingSet2 - Java L&F - Slider leaves out tracks while dragging forward or downward

Steps to reproduce -
1. Launch SwingSet2 demo with metal pipeline
2. Switch to Java Look & Feel using menu
3. Using Theme menu - select any theme apart from Ocean (Bug is not seen for Ocean theme)
4. Go to Slider Demo
5. The slider leaves out tracks (see attached screenshot) while dragging horizontal slider forward. Also, for vertical slider, issue can be seen while dragging the slider downward

Issue goes away as soon as we leave the slider.

Tested on macOS - Catalina - 10.15.6 - with default Retina display
Issue is reproducible with both - integrated and discrete graphics cards