As a consequence, some jobs (copy/duplicate) called on an ancestor of the unresolved type may fail and throw the following :
java.lang.AssertionError
at com.oracle.javafx.scenebuilder.kit.metadata.util.PropertyName.makeClassFullName(PropertyName.java:92)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMInstance.<init>(FXOMInstance.java:94)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMInstance.newInstance(FXOMInstance.java:136)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMNodes.newObject(FXOMNodes.java:161)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMPropertyC.newInstance(FXOMPropertyC.java:121)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMNodes.newProperty(FXOMNodes.java:249)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMInstance.newInstance(FXOMInstance.java:140)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMNodes.newObject(FXOMNodes.java:161)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMPropertyC.newInstance(FXOMPropertyC.java:121)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMNodes.newProperty(FXOMNodes.java:249)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMInstance.newInstance(FXOMInstance.java:140)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMNodes.newObject(FXOMNodes.java:161)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMNodes.newDocument(FXOMNodes.java:261)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMArchive.<init>(FXOMArchive.java:56)
at com.oracle.javafx.scenebuilder.kit.metadata.util.ClipboardEncoder.makeEncoding(ClipboardEncoder.java:78)
at com.oracle.javafx.scenebuilder.kit.editor.EditorController.performCopy(EditorController.java:1686)
at com.oracle.javafx.scenebuilder.kit.editor.EditorController.performControlAction(EditorController.java:1332)
at com.oracle.javafx.scenebuilder.app.DocumentWindowController.performCopy(DocumentWindowController.java:1397)
at com.oracle.javafx.scenebuilder.app.DocumentWindowController.performControlAction(DocumentWindowController.java:585)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController$DocumentControlActionController.perform(MenuBarController.java:1639)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController.handleOnActionMenu(MenuBarController.java:1115)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController.access$800(MenuBarController.java:90)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController$20.handle(MenuBarController.java:1108)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController$20.handle(MenuBarController.java:1104)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:204)
at javafx.scene.control.MenuItem.fire(MenuItem.java:462)
at com.sun.javafx.scene.control.GlobalMenuAdapter$5.handle(GlobalMenuAdapter.java:158)
at com.sun.javafx.scene.control.GlobalMenuAdapter$5.handle(GlobalMenuAdapter.java:156)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:204)
at javafx.scene.control.MenuItem.fire(MenuItem.java:462)
at com.sun.javafx.tk.quantum.GlassSystemMenu$6.action(GlassSystemMenu.java:234)