diff --git b/core/themes/classy/templates/content/entity.html.twig a/core/themes/classy/templates/content/entity.html.twig
index d5870b8..a137caa 100644
--- b/core/themes/classy/templates/content/entity.html.twig
+++ a/core/themes/classy/templates/content/entity.html.twig
@@ -1,4 +1,4 @@
-{% extends "entity.html.twig" %}
+{% extends "@stable/content/entity.html.twig" %}
 {#
 /**
  * @file