Problems after using Primefaces filter - jsf

Question

I have a datatable where one of the columns is editable.
As long as i dont use my filter i can navigate through my list and can edit the entry in any row i want. I dont get any errors and my changes are persisted in the DB correctly.
But after i once used any of the filter everything goes sideways. The filter itself works properly.
But when i now try to edit any entry the event.oldValue() from my CellEditEvent is always null and i cant persist my entries.
And only the first page of my paginator is filled with data. Every other page is empty.
Here is the view:
<div class="Container100">
<p:dataTable paginator="true" rows="15" var="listReportingParticipantOverview" value="#{reportingBean.listReportingParticipantOverview}"
id="participantOverviewId" widgetVar="participantOverviewId"
editable="true" editMode="cell" editInitEvent="dblclick"
emptyMessage="#{msg['system.no_result']}"
filteredValue="#{reportingBean.filteredListReportingParticipantOverview}">
<p:ajax event="cellEdit" listener="#{reportingBean.onCellEdit}" update=":reportingForm:msgs"/>
<p:column headerText="#{msg['model.reporting.participant_overview.name']}" filterBy="#{listReportingParticipantOverview.name}" filterMatchMode="contains">
<h:outputText value="#{listReportingParticipantOverview.name}" />
</p:column>
<p:column headerText="#{msg['model.reporting.participant_overview.dateOfBirth']}" filterBy="#{listReportingParticipantOverview.dateOfBirth}" filterMatchMode="contains">
<h:outputText value="#{listReportingParticipantOverview.dateOfBirth}" />
</p:column>
<p:column headerText="#{msg['model.reporting.participant_overview.email']}" filterBy="#{listReportingParticipantOverview.email}" filterMatchMode="contains">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{listReportingParticipantOverview.email}" />
</f:facet>
<f:facet name="input">
<p:inputText value="#{listReportingParticipantOverview.email}" style="width:100%" label="name"/>
</f:facet>
</p:cellEditor>
</p:column>
</p:dataTable>
</div>
Here is the bean:
#SessionScoped
#ManagedBean(name = "reportingBean2")
public class ReportingBean2 extends BeanController implements Serializable {
List<ReportingParticipantOverview> listReportingParticipantOverview = new ArrayList<ReportingParticipantOverview>();
List<ReportingParticipantOverview> filteredListReportingParticipantOverview;
ContactRepository contactRepository;
ContactRepository contactRepositoryOtherDBContext;
CommunicationRepository communicationRepositoryOtherDBContext;
private AbstractApplicationContext otherDBContext;
public void initData() {
this.listReportingParticipantOverview = this.contactRepositoryOtherDBContext
.selectParticipantOverviewReporting();
}
#PostConstruct
public void init() {
otherDBContext = new ClassPathXmlApplicationContext("applicationContext_otherDB.xml");
this.contactRepository = this.getApplicationContext().getBean(ContactRepository.class);
this.contactRepositoryOtherDBContext = otherDBContext.getBean(ContactRepository.class);
this.communicationRepositoryOtherDBContext = otherDBContext.getBean(CommunicationRepository.class);
}
public void onCellEdit(CellEditEvent event) {
Object oldValue = event.getOldValue();
Object newValue = event.getNewValue();
// ...
}
public List<ReportingParticipantOverview> getListReportingParticipantOverview() {
return listReportingParticipantOverview;
}
public void setListReportingParticipantOverview(
List<ReportingParticipantOverview> listReportingParticipantOverview) {
this.listReportingParticipantOverview = listReportingParticipantOverview;
}
public List<ReportingParticipantOverview> getFilteredListReportingParticipantOverview() {
return filteredListReportingParticipantOverview;
}
public void setFilteredListReportingParticipantOverview(
List<ReportingParticipantOverview> filteredListReportingParticipantOverview) {
this.filteredListReportingParticipantOverview = filteredListReportingParticipantOverview;
}
}
}
I am using Java 8, Eclipse 2021-03 and Primefaces 10.0.0.
Any help appreciated :-)