JMenuSelectedColorTest fails in Ubuntu 20.04 dual-monitor

ADDITIONAL SYSTEM INFORMATION :
$ uname -a
Linux unit-417 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

$ jdk-11.0.9/bin/java -version
java version "11.0.9" 2020-10-20 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.9+7-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.9+7-LTS, mixed mode)

$ jdk-15.0.1/bin/java -version
java version "15.0.1" 2020-10-20
Java(TM) SE Runtime Environment (build 15.0.1+9-18)
Java HotSpot(TM) 64-Bit Server VM (build 15.0.1+9-18, mixed mode, sharing)


A DESCRIPTION OF THE PROBLEM :
The test javax/swing/JMenu/JMenuSelectedColorTest.java throws java.lang.RuntimeException: The expected highlight color for Menu was not found
The issue was observed on Ubuntu 20.04 in dual-monitor configuration. The test passes successfully in case of one-monitor

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
$ jtreg//bin/jtreg -testjdk:/home/builduser/jdk-15.0.1 test/jdk/javax/swing/JMenu/JMenuSelectedColorTest.java
$ jtreg//bin/jtreg -testjdk:/home/builduser/jdk-11.0.9 test/jdk/javax/swing/JMenu/JMenuSelectedColorTest.java


ACTUAL -
#section:main
----------messages:(5/275)----------
command: main -Djdk.gtk.version=3 JMenuSelectedColorTest
reason: User specified action: run main/othervm -Djdk.gtk.version=3 JMenuSelectedColorTest
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.desktop
elapsed time (seconds): 3.857
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(0/0)----------
----------System.err:(13/914)----------
java.lang.RuntimeException: The expected highlight color for Menu was not found
at JMenuSelectedColorTest.main(JMenuSelectedColorTest.java:162)
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: The expected highlight color for Menu was not found
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: The expected highlight color for Menu was not found


---------- BEGIN SOURCE ----------
http://hg.openjdk.java.net/jdk/jdk15/file/0dabbdfd97e6/test/jdk/javax/swing/JMenu/JMenuSelectedColorTest.java
---------- END SOURCE ----------

FREQUENCY : always