Camel Quartz cron job not triggering

Issue

We experience a strange behavior.

In our test, the route below stops a route at exact 5pm.

        <route id="stop-sending-faxes">
            <from uri="quartz2://sendFaxes/stopSending?cron=00+00+17+?+*+1-5+*"/>
            <log message="Stopping the route to process faxes"/>
            <to uri="bean:routeControlBus?method=stopRoute"/>
        </route>

However, the route below doesn't start the route at 9am

        <route id="start-sending-faxes">
            <from uri="quartz2://sendFaxes/startSending?cron=00+00+09+?+*+1-5+*"/>
            <log message="Starting the route to process faxes"/>
            <to uri="bean:routeControlBus?method=startRoute"/>
        </route>