diff -u b/core/modules/rdf/templates/rdf-metadata.html.twig b/core/modules/rdf/templates/rdf-metadata.html.twig
--- b/core/modules/rdf/templates/rdf-metadata.html.twig
+++ b/core/modules/rdf/templates/rdf-metadata.html.twig
@@ -21,3 +21,3 @@
   %}
-  <span{{ attributes }}{{ attributes.addClass(classes) }}></span>
+  <span{{ attributes.addClass(classes) }}></span>
 {% endfor %}