JFR: oldobject/TestG1.java can't find leaking object

This test failed in the JDK15 CI:

jdk/jfr/event/oldobject/TestG1.java

Here's a snippet from the failing log file:

----------System.err:(13/957)----------
java.lang.Exception: Could not find leak with class [Ljdk.jfr.event.oldobject.TestG1$FindMe;
at jdk.jfr.event.oldobject.TestG1.main(TestG1.java:66)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: java.lang.Exception: Could not find leak with class [Ljdk.jfr.event.oldobject.TestG1$FindMe;
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.Exception: Could not find leak with class [Ljdk.jfr.event.oldobject.TestG1$FindMe;
----------rerun:(44/5541)*----------