The test javax/swing/JInternalFrame/DockIconRepaint/DockIconRepaint.java fails with the following output :

#section:main
----------messages:(5/204)----------
command: main DockIconRepaint
reason: Assumed action based on file name: run main DockIconRepaint
Mode: othervm
Additional options from @modules: --add-modules java.desktop
elapsed time (seconds): 7.821
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(0/0)----------
----------System.err:(25/2972)----------
metalEnabled=1
2020-01-30 16:36:47.340 java[22288:1090505] CoreText note: Client requested name ".SFNS-Regular", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2020-01-30 16:36:47.340 java[22288:1090505] CoreText note: Set a breakpoint on CTFontLogSystemFontNameRequest to debug.
2020-01-30 16:36:47.342 java[22288:1090505] CoreText note: Client requested name ".SFNS-Bold", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2020-01-30 16:36:47.342 java[22288:1090505] CoreText note: Client requested name ".SFNSMono-Regular", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2020-01-30 16:36:47.346 java[22288:1090505] CoreText note: Client requested name ".SFNSMono-Regular", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2020-01-30 16:36:47.346 java[22288:1090505] CoreText note: Client requested name ".SFNSMono-Regular", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2020-01-30 16:36:47.350 java[22288:1090505] CoreText note: Client requested name ".SFNS-Regular", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2020-01-30 16:36:47.350 java[22288:1090505] CoreText note: Client requested name ".SFNS-Bold", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
Exp: ff00ff00
Actual: ff00ff02
java.lang.RuntimeException: Wrong color.
at DockIconRepaint.test(DockIconRepaint.java:104)
at DockIconRepaint.main(DockIconRepaint.java:68)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Wrong color.
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Wrong color.

The failure was not observed on OpenJDK builds jdk-14-ea+33_osx-x64, jdk-15-ea+7_osx-x64

The reproducibility: 100%
Steps to reproduce:

$ jtreg -Dsun.java2d.metal=true -testjdk:[path_to_lanai_home] test/jdk/javax/swing/JInternalFrame/DockIconRepaint/DockIconRepaint.java