Primefaces p:dialog modal="true" appendToBody it´s not working - primefaces

Question

I tried many things for this workaround, but now I found a issue with p:dialog.
If I use modal="false" everything works fine.
But if I use modal="true" and appendTo="#(body)" and want to use a footer the p:dialog doesnt work.
The h:form doesn´t validate the fields.
<p:dialog message="Add Ticket" header="Add Ticket"
draggable="true" resizable="true" closeOnEscape="true"
appendTo="#(body)" modal="true" widgetVar="addTicketReportingDialog">
<h:form id="addTicketReportingForm">
<h:panelGrid id="ticketReportingAddPanelGrid" columns="2">
<p:outputLabel for="ticketReporting_name" value="Name:" />
<p:inputText id="ticketReporting_name" size="33" required="true"
requiredMessage="Please add a value"
value="#{ticketReportingEditController.ticketReporting.title}" />
</h:panelGrid>
<br></br>
<f:facet name="footer">
<p:commandButton value="Save"
oncomplete="if (!args.validationFailed) addTicketReportingDialog.hide()"
update=":ticketReportingListForm:ticketReportingListDatatable,messagesAddTicketReporting,:addTicketReportingForm:ticketReportingAddPanelGrid"
actionListener="#{ticketReportingEditController.doSave}"
ajax="true" />
<h:outputText value=" or " />
<p:commandLink ajax="true" process="#this"
onclick="addTicketReportingDialog.hide();">
<h:outputText value="Close" />
</p:commandLink>
<p:messages id="messagesAddTicketReporting" showDetail="false"
for="messagesAddTicketReporting" autoUpdate="false"
closable="true" />
</f:facet>
</h:form>
</p:dialog>