Lanai: java/awt/GradientPaint/LinearColorSpaceGradientTest.java test fails

The test java/awt/GradientPaint/LinearColorSpaceGradientTest.java fails with the following output :

#section:main
----------messages:(5/230)----------
command: main LinearColorSpaceGradientTest
reason: Assumed action based on file name: run main LinearColorSpaceGradientTest
Mode: othervm
Additional options from @modules: --add-modules java.desktop
elapsed time (seconds): 0.502
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(0/0)----------
----------System.err:(15/900)----------
metalEnabled=1
java.lang.RuntimeException: Test FAILED!
at LinearColorSpaceGradientTest.test(LinearColorSpaceGradientTest.java:86)
at LinearColorSpaceGradientTest.main(LinearColorSpaceGradientTest.java:111)
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: Test FAILED!
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Test FAILED!


The failure was not observed on OpenJDK build jdk-15-ea+8_osx-x64
The test successfully passes with -Dsun.java2d.metal=false

The reproducibility: 100%
Steps to reproduce:

$ jtreg -Dsun.java2d.metal=true -testjdk:[path_to_lanai_home] test/jdk/java/awt/GradientPaint/LinearColorSpaceGradientTest.java