The test java/awt/Focus/ActualFocusedWindowTest/ActualFocusedWindowBlockingTest.java fails with the following diagnostic:

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#section:main
----------messages:(5/224)----------
command: main ActualFocusedWindowBlockingTest
reason: User specified action: run main ActualFocusedWindowBlockingTest
Mode: othervm
Additional options from @modules: --add-modules java.desktop
elapsed time (seconds): 2.405
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(53/7396)----------
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=null,oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=null,cause=ACTIVATION] on button0
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Window_Button,cause=ACTIVATION] on button0
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[OWNER_FRAME,100,27,400x150,invalid,layout=java.awt.FlowLayout,title=Owner Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Frame_Button,cause=ACTIVATION] on button1
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Auxiliary_Button,cause=ACTIVATION] on button1
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Window_Button,cause=ACTIVATION] on button2

Test started:

--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Window_Button,cause=ACTIVATION] on button2
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Auxiliary_Button,cause=ACTIVATION] on button1
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Auxiliary_Button,cause=ACTIVATION] on button1
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Window_Button,cause=ACTIVATION] on button2
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Frame_Button,cause=ACTIVATION] on button2
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[OWNER_FRAME,100,27,400x150,invalid,layout=java.awt.FlowLayout,title=Owner Frame,resizable,normal],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Auxiliary_Button,cause=ACTIVATION] on button0
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Window_Button,cause=ACTIVATION] on button0
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[OWNER_FRAME,100,27,400x150,invalid,layout=java.awt.FlowLayout,title=Owner Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Frame_Button,cause=ACTIVATION] on button1
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Auxiliary_Button,cause=ACTIVATION] on button1
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Window_Button,cause=ACTIVATION] on button2
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Frame_Button,cause=ACTIVATION] on button2
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[OWNER_FRAME,100,27,400x150,invalid,layout=java.awt.FlowLayout,title=Owner Frame,resizable,normal],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Auxiliary_Button,cause=ACTIVATION] on button0
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Window_Button,cause=ACTIVATION] on button0
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[OWNER_FRAME,100,27,400x150,invalid,layout=java.awt.FlowLayout,title=Owner Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Frame_Button,cause=ACTIVATION] on button1
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Auxiliary_Button,cause=ACTIVATION] on button1
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNED_WINDOW
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Window[OWNED_WINDOW,100,200,400x150,layout=java.awt.FlowLayout],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Window_Button,cause=ACTIVATION] on button2
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Frame_Button,cause=ACTIVATION] on button2
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[OWNER_FRAME,100,27,400x150,invalid,layout=java.awt.FlowLayout,title=Owner Frame,resizable,normal],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Auxiliary_Button,cause=ACTIVATION] on button0
--> java.awt.event.FocusEvent[FOCUS_LOST,temporary,opposite=Auxiliary_Button,cause=ACTIVATION] on button0
--> java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=java.awt.Frame[AUX_FRAME,100,400,400x150,layout=java.awt.FlowLayout,title=Auxiliary Frame,resizable,normal],oldState=0,newState=0] on OWNER_FRAME
--> java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=java.awt.Frame[OWNER_FRAME,100,27,400x150,invalid,layout=java.awt.FlowLayout,title=Owner Frame,resizable,normal],oldState=0,newState=0] on AUX_FRAME
--> java.awt.event.FocusEvent[FOCUS_GAINED,permanent,opposite=Frame_Button,cause=ACTIVATION] on button2
----------System.err:(12/1050)----------
ActualFocusedWindowBlockingTest$TestFailedException: Test failed: The owner's component [Frame_Button] couldn't be focused as the most recent focus owner
at ActualFocusedWindowBlockingTest.start(ActualFocusedWindowBlockingTest.java:109)
at ActualFocusedWindowBlockingTest.main(ActualFocusedWindowBlockingTest.java:50)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:833)

JavaTest Message: Test threw exception: ActualFocusedWindowBlockingTest$TestFailedException: Test failed: The owner's component [Frame_Button] couldn't be focused as the most recent focus owner
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: ActualFocusedWindowBlockingTest$TestFailedException: Test failed: The owner's component [Frame_Button] couldn't be focused as the most recent focus owner
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The failure was observed on Ubuntu 21.04. It was not observed on Ubuntu 18.04. The test passed successfully on Windows and macOS.

It is not a regression since similar failure was observed on 11.0.2+9

Probabaly it imay be a Wayland specific failure.