diff -u b/core/modules/node/templates/field--node--created.html.twig b/core/modules/node/templates/field--node--created.html.twig
--- b/core/modules/node/templates/field--node--created.html.twig
+++ b/core/modules/node/templates/field--node--created.html.twig
@@ -29,7 +29,7 @@
     'field-label-' ~ label_display,
   ]
 %}
-<span{{ attributes }}>
+<span{{ attributes.addClass(classes) }}>
   {%- for item in items -%}
     {{ item.content }}
   {%- endfor -%}
diff -u b/core/modules/node/templates/field--node--uid.html.twig b/core/modules/node/templates/field--node--uid.html.twig
--- b/core/modules/node/templates/field--node--uid.html.twig
+++ b/core/modules/node/templates/field--node--uid.html.twig
@@ -29,7 +29,7 @@
     'field-label-' ~ label_display,
   ]
 %}
-<span{{ attributes }}>
+<span{{ attributes.addClass(classes) }}>
   {%- for item in items -%}
     {{ item.content }}
   {%- endfor -%}