The following tests failed on an ubuntu-22-04 machine in the JDK26 CI.
For all five failures, the screen.png file shows a white square in the upper
left corner of the screen. It appears to be the same square in all five failing
tests:

sun/awt/dnd/8024061/bug8024061.java
java/awt/Toolkit/TimeUnsignedConversionTest.java
java/awt/Toolkit/ScreenInsetsTest/ScreenInsetsTest.java
java/awt/LightweightComponent/MultipleAddNotifyTest/MultipleAddNotifyTest.java
java/awt/Frame/MaximizeUndecoratedTest.java

I suspect that a previous test in the batch has failed or gotten stuck
and is responsible for the white square in the upper left corner of
the screen and it is causing subsequent tests to fail.