How to specify SHM locator

[Hugal31]

I want to create a profile where most locators would use UDP and SHM, and specific locators would use TCP or SHM. However, if I specify UDP or TCP locators for a given reader/writer, it drops the SHM endpoints.

Here is a sample configuration:

<?xml version="1.0" encoding="UTF-8" ?>
<dds xmlns="http://www.eprosima.com/XMLSchemas/fastRTPS_Profiles"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.eprosima.com https://raw.githubusercontent.com/eProsima/Fast-DDS/refs/tags/v2.6.9/resources/xsd/fastRTPS_profiles.xsd">

    <profiles>
        <transport_descriptors>
            <transport_descriptor>
                <transport_id>tcp_transport</transport_id>
                <type>TCPv4</type>
                <listening_ports><port>0</port></listening_ports>
            </transport_descriptor>
            <transport_descriptor>
                <transport_id>udp_transport</transport_id>
                <type>UDPv4</type>
            </transport_descriptor>
            <transport_descriptor>
                <transport_id>shm_transport</transport_id>
                <type>SHM</type>
            </transport_descriptor>
        </transport_descriptors>

        <participant profile_name="default_participant" is_default_profile="true">
            <rtps>
                <userTransports>
                    <transport_id>tcp_transport</transport_id>
                    <transport_id>shm_transport</transport_id>
                    <transport_id>udp_transport</transport_id>
                </userTransports>
                <useBuiltinTransports>false</useBuiltinTransports>
            </rtps>
        </participant>

        <data_reader profile_name="/news" is_default_profile="false">
            <unicastLocatorList>
                <locator>
                    <tcpv4/>
                </locator>
            </unicastLocatorList>
        </data_reader>
        <data_writer profile_name="/news" is_default_profile="false">
            <unicastLocatorList>
                <locator>
                    <tcpv4/>
                </locator>
            </unicastLocatorList>
        </data_writer>

        <data_writer profile_name="default_writer" is_default_profile="true">
            <unicastLocatorList>
                <locator>
                    <udpv4/>
                </locator>
            </unicastLocatorList>
        </data_writer>
        <data_reader profile_name="default_reader" is_default_profile="true">
            <unicastLocatorList>
                <locator>
                    <udpv4/>
                </locator>
            </unicastLocatorList>
        </data_reader>
    </profiles>
</dds>

Here, the /news profile only uses TCP and not SHM, and the default profile only uses UDP and not SHM. If for example I remove the default reader/writer profile, it now uses TCP, UDP and SHM.

How can I restrict a given data reader/writer profile to one protocol and SHM?

I am using Fast-DDS 2.6.9 if that matters.

P.S.: This applies wherever I can specify a locator list, as for example in the defaultUnicastLocatorList