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I've followed this guide to get comments inside an Asset Publisher Template, adapting it from JSP to FreeMarker:

<#assign discussionURL = renderResponse.createActionURL() />
${discussionURL.setParameter("javax.portlet.action", "invokeTaglibDiscussion")}
<@liferay_comment["discussion"]
  className=entry.getClassName()
  classPK=entry.getClassPK()
  formAction=discussionURL?string
  formName="fm" + entry.getClassPK()?string
  ratingsEnabled=false
  redirect=currentURL
  userId=entry.getUserId()
/>

This creates a partial version of comments component: the problem is that the Alloy Editor to insert a comment is missing!
Inside logs I can see that a NullPointerException is thrown:

java.lang.NullPointerException
    at com.liferay.taglib.ui.InputEditorTag$LazyDataInvocationHandler.invoke(InputEditorTag.java:598)
    at org.apache.jsp.alloyeditor_jsp._jspService(alloyeditor_jsp.java:219)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at com.liferay.portal.osgi.web.servlet.jsp.compiler.internal.JspServlet.service(JspServlet.java:319)
    at com.liferay.portal.osgi.web.servlet.jsp.compiler.internal.JspServlet.service(JspServlet.java:330)
    at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153)
    at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:62)
    at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120)
    at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48)
    at com.liferay.portal.servlet.DirectServletPathRegisterDispatcher.include(DirectServletPathRegisterDispatcher.java:67)
    at com.liferay.portal.servlet.DirectRequestDispatcherFactoryImpl$IndirectRequestDispatcher.include(DirectRequestDispatcherFactoryImpl.java:202)
    at com.liferay.portal.servlet.ClassLoaderRequestDispatcherWrapper.doDispatch(ClassLoaderRequestDispatcherWrapper.java:79)
    at com.liferay.portal.servlet.ClassLoaderRequestDispatcherWrapper.include(ClassLoaderRequestDispatcherWrapper.java:53)
    at com.liferay.taglib.util.IncludeTag.includePage(IncludeTag.java:401)
    at com.liferay.taglib.ui.InputEditorTag.includePage(InputEditorTag.java:459)

Debugging a little bit, I found that the issue seems to be at line 26 of modules/apps/frontend-editor/frontend-editor-alloyeditor-web/src/main/resources/META-INF/resources/alloyeditor.jsp:

Map<string, object> data = (Map<string, object>)request.getAttribute(AlloyEditorConstants.ATTRIBUTE_NAMESPACE + ":data");
</string,></string,>

I don't know if the problem is the assignment or casting to a Map but I cannot make a System.out.println() after that line.
Have you got any hint or workaround?
Thank you!
Edit: I've opened an issue for this topic.