Ticket #46471: 46471.1.diff

src/wp-includes/post-template.php

@@ -297 +297 @@
         $content = $pages[ $page - 1 ];
         if ( preg_match( '/<!--more(.*?)?-->/', $content, $matches ) ) {
                 $content = explode( $matches[0], $content, 2 );
+
+                // Remove the core/more block tags now that it has been split up.
+                $content = preg_replace( '/<!-- \/?wp:more(.*?) -->/', '', $content );
+
                 if ( ! empty( $matches[1] ) && ! empty( $more_link_text ) ) {
                         $more_link_text = strip_tags( wp_kses_no_null( trim( $matches[1] ) ) );
                 }