327 client tests failed in a single task in the JDK16 CI.

The test machine is running Windows_10_pro.

Here's a snippet from the
java/awt/Modal/ModalBlockingTests/BlockingWindowsSetModal3Test.java
log file:

#section:main
----------messages:(5/224)----------
command: main BlockingWindowsSetModal3Test
reason: User specified action: run main BlockingWindowsSetModal3Test
Mode: othervm
Additional options from @modules: --add-modules java.desktop
elapsed time (seconds): 27.586
----------configuration:(3/43)----------
Boot Layer
  add modules: java.desktop

----------System.out:(0/0)----------
----------System.err:(19/1372)----------
java.lang.RuntimeException: Clicking the frame Open button did not trigger an action. : expected false to equal true
at jdk.test.lib.Asserts.fail(Asserts.java:594)
at jdk.test.lib.Asserts.assertEquals(Asserts.java:205)
at jdk.test.lib.Asserts.assertEQ(Asserts.java:178)
at TestFrame.clickOpenButton(TestFrame.java:219)
at TestFrame.clickOpenButton(TestFrame.java:206)
at BlockingWindowsTest.doTest(BlockingWindowsTest.java:170)
at BlockingWindowsSetModal3Test.main(BlockingWindowsSetModal3Test.java:48)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
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: Clicking the frame Open button did not trigger an action. : expected false to equal true
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Clicking the frame Open button did not trigger an action. : expected false to equal true
----------rerun:(46/5933)*----------