When testing the 8347937 fix, I enabled the -Xcheck:jni option for each test run and several errors occurred:

FATAL ERROR in native method: Bad global or local ref passed to JNI
        at com.sun.webkit.WebPage.twkDestroyPage(javafx.web@25-internal/Native Method)
        at com.sun.webkit.WebPage.dispose(javafx.web@25-internal/WebPage.java:1045)
        at javafx.scene.web.WebEngine$SelfDisposer.dispose(javafx.web@25-internal/WebEngine.java:1125)
        at com.sun.webkit.Disposer$WeakDisposerRecord.dispose(javafx.web@25-internal/Disposer.java:192)
        at com.sun.webkit.Disposer$DisposerRunnable.run(javafx.web@25-internal/Disposer.java:168)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$4(javafx.graphics@25-internal/PlatformImpl.java:424)
        at com.sun.javafx.application.PlatformImpl$$Lambda/0x00001800011b8638.run(javafx.graphics@25-internal/Unknown Source)
        at com.sun.glass.ui.monocle.RunnableProcessor.runLoop(javafx.graphics@25-internal/RunnableProcessor.java:92)
        at com.sun.glass.ui.monocle.RunnableProcessor.run(javafx.graphics@25-internal/RunnableProcessor.java:51)
        at java.lang.Thread.runWith(java.base@22/Thread.java:1583)
        at java.lang.Thread.run(java.base@22/Thread.java:1570)


Particularly LeakTest, FormControlsTest, LoadTest are affected.