diff -u b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php
--- b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php
+++ b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php
@@ -179,7 +179,7 @@
       }
       if ($check_interface_method) {
         $check_against_weight = $enabled_methods_content[LanguageNegotiationUI::METHOD_ID];
-        $check_against_weight = isset($enabled_methods_content[LanguageNegotiationUI::METHOD_ID]) ? max($check_against_weight, $enabled_methods_content[LanguageNegotiationUrl::METHOD_ID]) : $check_against_weight;
+        $check_against_weight = isset($enabled_methods_content[LanguageNegotiationUrl::METHOD_ID]) ? max($check_against_weight, $enabled_methods_content[LanguageNegotiationUrl::METHOD_ID]) : $check_against_weight;
       }
       else {
         $check_against_weight = isset($enabled_methods_content[LanguageNegotiationUrl::METHOD_ID]) ? $enabled_methods_content[LanguageNegotiationUrl::METHOD_ID] : PHP_INT_MAX;