f:websocket does not call p:ajax listeners

We have following websocket definition:

{{ <f:websocket channel="dispatcherChannel" user="#{userBean.getUserId()}" scope="application" >}}
    <p:ajax event="broadcastMsgPushOpenEvent"
            listener="#{broadcastMessageBean.onNewBroadcastMsg()}"
            update="pnlBroadcastMsg"
            ignoreAutoUpdate="true"
            global="false"/>
    <p:ajax event="broadcastMsgPushCloseEvent"
            listener="#{broadcastMessageBean.onCloseDialogFromPush()}"
            update="pnlBroadcastMsg"
            ignoreAutoUpdate="true"
            global="false"/>
{{ </f:websocket>}}{{}}

client browser receives websocket pushes, but does not execute listener's actions on server side, otherwise update is executed. We are using forwarding from ajax's onstart=".." to <p:remoteCommand> as a workaround now. In the past we had been using o:socket with p:ajax without problems.