PrimeFaces commandButton not working after being loaded from AJAX - jsf

Question

I'm working on a project with JSF + Primefaces 6.0.
On this particular page there is something wrong which I don't know how to fix.
When #selected-operator or #selected-site values are changed the form#operatorsForm is updated correctly via AJAX and the results are displayed in the datatable.
The problem is when I click on the commandButton that is loaded within the datatable the modal dialog "confirmWV" is not showing.
On my other pages I have the same code for modals but buttons there are not loaded via AJAX so this makes me think it is AJAX related issue.
When debugging, clicking on the button is not calling the method confirmOperatorsRightsAction().
Thank you for your help!
page.xhtml
<h:form id="operatorForm">
<p:selectOneMenu id="selected-operator"
value="#{operatorController.selectedOperator}">
<f:selectItem itemValue="" itemLabel="Choose operator" />
<f:selectItems value="#{operatorBean.getOperatorsList()}"
var="operator" itemLabel="#{operator.username}"
itemValue="#{operator.idPk}" />
<f:ajax execute="selected-operator" />
</p:selectOneMenu>
<p:selectOneMenu id="selected-site"
value="#{operatorBean.selectedSite}">
<f:selectItem itemValue="" itemLabel="Choose site" />
<f:selectItems value="#{operatorBean.getSites()}"
var="site" itemLabel="#{site.strname}" itemValue="#{site.idPk}" />
<f:ajax execute="selected-site" />
</p:selectOneMenu>
</h:form>
<h:form id="operatorsForm">
<p:dataTable var="operatorSite"
value="#{operatorBean.getOperatorSites()}"
id="operators-list">
<p:column headerText="#{msg['item.Username']}">
#{operatorSite.operator.username}
</p:column>
<p:column headerText="#{msg['item_SiteName']}">
#{operatorSite.site.strname}
</p:column>
<p:column headerText="">
<p:commandButton
actionListener="#{operatorBean.confirmOperatorsRightsAction(operatorSite)}"
value="#{msg['item_Delete']}"
icon="fa fa-trash">
</p:commandButton>
</p:column>
</p:dataTable>
</h:form>
<p:dialog widgetVar="confirmWV" modal="true"
header="#{msg['modal.confirm.title']}" height="150" width="450">
<h:form id="confirmOperatorForm">
<my:confirm />
</h:form>
</p:dialog>
OperatorBean.java
public void confirmOperatorsRightsAction(OperatorSite os) {
//some code here
RequestContext.getCurrentInstance().update("confirmOperatorForm");
RequestContext.getCurrentInstance().execute("PF('confirmWV').show();");
}