p:selectManyMenu filter doesn't work with itemDisabled

My p:selectManyMenu has a filter and it works fine when I remove itemDisabled from f:selectItems.

However, when I use itemDisabled the filtered values are wrong.

How to solve that?

<p:selectManyMenu
    id="horario"
    value="#{clienteMB.horariosSelecionados}"
    converter="MultiSelectEntityConverter"
    var="t"
    filter="true"
    filterMatchMode="contains"
    showCheckbox="true">
    <f:selectItems
        itemDisabled="#{not empty consulta.datamarc}"
        value="#{clienteMB.horarioList}"
        var="consulta"
        itemLabel="#{consulta.dataHoraFormatted()}"
        itemValue="#{consulta}" />
    <p:column>
        <h:outputText value="#{t.dataHoraFormatted()}" />
    </p:column>
</p:selectManyMenu>