After JDK-8139208 (jdk22) one of our applications changed behaviour.

It is supposed to start up iconified. This worked on mac before JDK-8139208. Now an empty frame is shown. It needs to be iconified by the user. See also attached test program.

Especially these two statements don't do what I would expect:
frame.setExtendedState(JFrame.ICONIFIED);
frame.setVisible(true);

It seems they are both skipped after JDK-8139208. But when
deminimizing the frame at least setVisible() is called.

Also I figured the behavior differs on Windows (Program starts up as icon.) and Linux (Program starts up as frame with visible components.).