"Could not find model element for selection" exception for `find references` on transition triggers

[tangele]

1. create new statechart file
2. add in event BB, to definition section
3. create self transition using trigger BB
4. select BB inside the transition properties view
5. do a find references search

Error dialog pops up:

Error in Reference Search

Reason: Could not find model element for selection!

Details:

Could not find model element for selection!
Could not find model element for selection!
  java.lang.Thread.getStackTrace(Unknown Source)
  com.yakindu.sct.search.ui.handler.ModelReferenceHandler.execute(ModelReferenceHandler.java:39)
  org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:291)
  org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:93)
  sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  java.lang.reflect.Method.invoke(Unknown Source)
  org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
  org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:318)
  org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:252)
  org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:161)
  org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
  org.eclipse.core.commands.Command.executeWithChecks(Command.java:494)
  org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:487)
  org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:204)
  org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:433)
  org.eclipse.e4.ui.workbench.renderers.swt.AbstractContributionItem.handleWidgetSelection(AbstractContributionItem.java:446)
  org.eclipse.e4.ui.workbench.renderers.swt.AbstractContributionItem.lambda$2(AbstractContributionItem.java:472)
  org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
  org.eclipse.swt.widgets.Display.sendEvent(Display.java:4118)
  org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052)
  org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3931)
  org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3534)
  org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1170)
  org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
  org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1059)
  org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
  org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:667)
  org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
  org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:597)
  org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
  org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
  org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
  org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
  org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
  org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
  org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
  sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  java.lang.reflect.Method.invoke(Unknown Source)
  org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:656)
  org.eclipse.equinox.launcher.Main.basicRun(Main.java:592)
  org.eclipse.equinox.launcher.Main.run(Main.java:1498)
  org.eclipse.equinox.launcher.Main.main(Main.java:1471)

[tangele]

in the grapical editor (not the properties view):

• double click to select transition trigger aa && find references ---> above exception
• single click before the two letters |aa && find references ---> above exception, most deterministic example
• single click between the two letters a|a && find references --> no exception, works as expected
• single click between the two letters aa| && find references --> no exception, works as expected

again, not fully deterministic?! (happens sometimes, not always)