Boot the device using the demo image and wait for the application launcher.
Select Web Browser demo application.
After the Web Browser application has started, perform a long press touch or click the right mouse button anywhere in the WebView area.
Application locks up (crashes)

Can also be duplicated by creating a simple QtQuick 2.5 app that instantiates a WebEngineView. Console output upon crash is as follows:

file:///usr/lib/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:186:9: QML Binding: Property 'raised' does not exist on Item.
file:///usr/lib/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:137:9: QML Binding: Property 'raised' does not exist on Item.
EGLFS: OpenGL windows cannot be mixed with others.
Application crashed: /webtest
Process stopped
quit