Primefaces selectOneMenu in dialog breaks when scrolling - jsf

Question

When I use p:selectOneMenu in p:dialog, selectOneMenu's panel is detached from selectOneMenu when scrolling. I found a few similar posts, but none of those solutions work:
p:selectOneMenu dropdown part scrolls and does not stay in position
p:selectOneMenu dropdown not attached to the component inside a dialog
SelectOneMenu panel scrolls with the mouse wheel
Basically all the proposed solutions use appendTo="#this", but it doesn't work in my case. I use PF 6.2.27.
Here's a part of my dialog:
<ui:composition xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:portlet="http://java.sun.com/portlet_2_0"
xmlns:p="http://primefaces.org/ui">
<p:dialog id="dlgTest" widgetVar="dlgTestWidget" header="My dialog" closeOnEscape="true" modal="true" resizable="false"
width="1000" height="800">
<p:panelGrid id="pnlData" styleClass="common-panel-grid">
<p:row>
<p:column>
<p:fieldset legend="HEADER" toggleable="false">
<h:panelGrid id="pgUseCase" >
<p:row>
...
</p:row>
<p:row>
<p:column colspan="2">
<p:selectOneMenu id="somServices" value="#{bean.selectedService}" effect="none" disabled="#{not bean.serviceEnabled}"
converter="serviceConverter" appendTo="#this">
<f:selectItem itemLabel="" itemValue="#{null}" noSelectionOption="true" />
<f:selectItems var="item" value="#{bean.serviceList}" itemLabel="#{item.name}" itemValue="#{item}" />
</p:selectOneMenu>
</p:column>
</p:row>
</h:panelGrid>
</p:fieldset>
</p:column>
</p:row>
</p:panelGrid>
</p:dialog>
</ui:composition>
Does anyone have some other solution to this problem?