MatchingIpInterfacePolicy doesn't seem to work

Defining a MatchingIpInterfacePolicy doesn't actually seem to affect the discovery of nodes in any way.
These steps should reproduce the problem:

Lets say you have a bunch of nodes in the 172.16.48.1-255 range. And you want to exclude a certain node with ip 172.16.48.188.

1. Do a clean install of OpenNMS 1.10.0

2. Create a provisioning group with the following:
<foreign-source date-stamp="2012-02-02T19:30:46.429+01:00" name="Default" xmlns="http://xmlns.opennms.org/xsd/config/foreign-source">
    <!-- bla bla -->
    <policies>
        <policy class="org.opennms.netmgt.provision.persist.policies.MatchingIpInterfacePolicy" name="test">
            <parameter value="DO_NOT_PERSIST" key="action"/>
            <parameter value="ALL_PARAMETERS" key="matchBehavior"/>
            <parameter value="172.16.48.188" key="ipAddress"/>
        </policy>
    </policies>
</foreign-source>

3. Set up discovery to scan the 172.16.48.1-255 range

4. Watch as OpenNMS includes 172.16.18.188 in spite of your policy.