Ticket #60473: 60473.diff

src/wp-includes/fonts/class-wp-font-utils.php

@@ -132 +132 @@
                         $slug_elements
                 );
 
-                return sanitize_text_field( join( ';', $slug_elements ) );
+                return sanitize_text_field( implode( ';', $slug_elements ) );
         }
 
         /**