The patch for JDK-8351907 disables all mouse extra buttons for any application run under XWayland GNOME of version >= 47. Also it makes impossible to perform horizontal scrolling via a mouse secondary wheel as well as via touchpad gestures.
If you analyze the changes of src/java.desktop/unix/classes/sun/awt/X11/XToolkit.java introduced in that patch, you realize that after some simplification the code performs the following:

if ( is-running-under-XWayland && is-running-under-gnome && gnome-version >= 47 ) {
    numberOfButtons = 3;
    // not asking the platform about the real number of buttons being supported
}

Trying to click any mouse additional button raises an exception like the following:

WARN - sun.awt.X11.XToolkit - Exception on Toolkit thread
java.lang.IllegalArgumentException: Nonexistent button 6
        at java.desktop/java.awt.event.MouseEvent.<init>(MouseEvent.java:774)
        at java.desktop/sun.awt.X11.XWindow.handleButtonPressRelease(XWindow.java:765)
        at java.desktop/sun.awt.X11.XContentWindow.handleButtonPressRelease(XContentWindow.java:45)
        at java.desktop/sun.awt.X11.XBaseWindow.dispatchEvent(XBaseWindow.java:1206)
        at java.desktop/sun.awt.X11.XBaseWindow.dispatchToWindow(XBaseWindow.java:1178)
        at java.desktop/sun.awt.X11.XToolkit.dispatchEvent(XToolkit.java:939)
        at java.desktop/sun.awt.X11.XToolkit.run(XToolkit.java:1086)
        at java.desktop/sun.awt.X11.XToolkit.run(XToolkit.java:968)
        at java.base/java.lang.Thread.run(Thread.java:1583)


Workarounds
- Setting the following VM option: -Dawt.robot.screenshotMethod=x11