is_gutenberg_editing() ) { ?> id == 'page' && $this->settings()->get( 'page_id' ) > 0 ) { // Is the block editor active for pages and is the classic editor not loaded? if ( function_exists( 'use_block_editor_for_post_type' ) && use_block_editor_for_post_type( 'page' ) && ! isset( $_GET['classic-editor'] ) ) { global $post; $all404pages = $this->core()->get_all_page_ids(); // Is the currently edited page a custom 404 error page? if ( in_array( $post->ID, $all404pages ) ) { return true; } } } return false; } } }