Comment 2 for bug 1936773

Triaged: High

Confirmed that the ovn plugin doesn't get the default-tenant-network-type and forces 'geneve' as the first item here:

https://github.com/openstack/charm-neutron-api-plugin-ovn/blob/c78ae6f8f307d34a29f9c9b810c7c44205c39e29/src/lib/charm/openstack/neutron_api_plugin_ovn.py#L228

    def tenant_network_types(self, neutron_tenant_network_types=None):
        """Provide list of tenant network types for current OpenStack release.

        The ``network_types`` class variable dfines which types to
        prepend and must be set in the release specific charm classes.

        :param neutron_tenant_network_types: Comma separated list of tenant
                                             network types from Neutron.
        :type neutron_tenant_network_types: Optional[str]
        :returns: List of tenant network types
        :rtype: List[str]
        """
        neutron_tenant_network_types = neutron_tenant_network_types or ''
        return self.network_types + [
            network_type
            for network_type in neutron_tenant_network_types.split(',')
        ]

self.network_types = ['geneve'] as a default.

To fix this, we have to float the default-default-tenant-network-type into the plugin relation-data and then make use of it in the plugin.