Can't parse SIR federation aggregate

[binaryape]

While testing SmeeOrgs:

DataSirCompatibilityTest [test/data/data_sir_compatibility_test.exs]
  * test basic compatibility smoke test can download the metadata from sir and parse a list of basic Organization records (196.9ms) [L#9]

  1) test basic compatibility smoke test can download the metadata from sir and parse a list of basic Organization records (DataSirCompatibilityTest)
     test/data/data_sir_compatibility_test.exs:9
     ** (MatchError) no match of right hand side value:

         ["<md:EntitiesDescriptor xmlns:md=\"urn:oasis:names:tc:SAML:2.0:metadata\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" ID=\"shib1metadata\" Name=\"https://www.rediris.es/sir/shib1metadata.xml\" validUntil=\"2026-04-13T12:57:23Z\" xsi:schemaLocation=\"urn:oasis:names:tc:SAML:2.0:metadata saml-schema-metadata-2.0.xsd urn:mace:shibboleth:metadata:1.0 shibboleth-metadata-1.0.xsd http://www.w3.org/2000/09/xmldsig# xmldsig-core-schema.xsd\">",
          "md:"]

     code: |> SmeeOrgs.stream()
     stacktrace:
       (smee 0.6.0) lib/smee/xml_munger.ex:285: Smee.XmlMunger.remove_groups/1
       (smee 0.6.0) lib/smee/xml_munger.ex:182: Smee.XmlMunger.process_metadata_xml/2
       (smee 0.6.0) lib/smee/metadata.ex:573: Smee.Metadata.split_to_stream/1
       (smee 0.6.0) lib/smee/metadata.ex:349: Smee.Metadata.stream_entities/2
       (smee_orgs 0.1.0) lib/smee_orgs/extract.ex:46: SmeeOrgs.Extract.stream/2
       test/data/data_sir_compatibility_test.exs:14: (test)