The test java/awt/Paint/ButtonRepaint.java fails with assertion as follows:

#section:main
----------messages:(5/198)----------
command: main ButtonRepaint
reason: Assumed action based on file name: run main ButtonRepaint
Mode: othervm
Additional options from @modules: --add-modules java.desktop
elapsed time (seconds): 2.9
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(2/56)----------
     Metal: Supported, feature set macOS GPUFamily2 v1

----------System.err:(3/138)----------
metalEnabled=1
Metal support is present
-[_MTLCommandEncoder dealloc]:70: failed assertion `Command encoder released without endEncoding'

It is a regression, the failure was not observed before 28/04/2020
The reproducibility: 100%
Steps to reproduce:

$ jtreg -javaoptions:'-Dsun.java2d.metal=true' -testjdk:[path_to_lanai_home] test/jdk/java/awt/Paint/ButtonRepaint.java