AWT test MakeWindowAlwaysOnTop.java intermittent macOS 11 ARM failure

java/awt/Dialog/MakeWindowAlwaysOnTop/MakeWindowAlwaysOnTop.java
failed two times in 40 runs on JDK 17 EA macOS 11 ARM

The log is

----------System.out:(1/39)----------
Color = java.awt.Color[r=55,g=55,b=55]
----------System.err:(13/909)----------
java.lang.RuntimeException: Test FAILED: unknown window is on top of the frame
at MakeWindowAlwaysOnTop.main(MakeWindowAlwaysOnTop.java:120)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:831)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Test FAILED: unknown window is on top of the frame
JavaTest Message: shutting down test