One sighting so far, on Windows with a fastdebug build and ZGC:

:
T:49 I:40 05:53:24.064643800: Terminated: char
T:39 I:38 05:53:24.064643800: Terminated: int
T:57 I:42 05:53:24.064643800: Terminated: double
No unexpected exceptions/errors are thrown
----------System.err:(15/882)----------
Exception in thread "Reference Handler" java.lang.OutOfMemoryError: Java heap space
nsk.share.TestFailure: Test exit code: 97
at nsk.share.test.Tests$TestRunner.execute(Tests.java:90)
at nsk.share.test.Tests$TestRunner.run(Tests.java:96)
at nsk.share.gc.GC.runTest(GC.java:114)
at gc.gctests.PhantomReference.phantom001.phantom001.main(phantom001.java:93)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:1584)

JavaTest Message: Test threw exception: nsk.share.TestFailure: Test exit code: 97
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: nsk.share.TestFailure: Test exit code: 97