Ticket #45337: 45337.diff

src/wp-includes/class-wp.php

@@ -684 +684 @@
                                         $page    = trim( $this->query_vars['page'], '/' );
                                         $success = (int) $page <= ( substr_count( $p->post_content, $next ) + 1 );
                                 }
+
+                                // Check if content is actually intended to be paged.
+                                if ( false === strpos( $p->post_content, $next ) && ! empty( $this->query_vars['page'] ) ) {
+                                        $success = false;
+                                }
                         }
 
                         if ( $success ) {