Lanai : J2DDemo - Lines - Rendering vanishes if width is changed using slider - recovers on window refresh

Launch J2DDemo with metal pipeline.
Go to Lines Demo -> demos.Lines.Joins

The rendering vanishes if the vertical slider on the left side is moved to change width. (See attached screenshot)
This recovers on window refresh.


Observed on build of - June 15, 2020 and with -Dsun.java2d.uiScale=1.0 or external monitor.

This is not reproducible on default retina screen or with -Dsun.java2d.uiScale=2.0