Update after rename

Author: dmsnell

src/wp-content/themes/twentytwentyone/inc/template-functions.php

@@ -377,14 +377,14 @@ function twenty_twenty_one_print_first_instance_of_block( $block_name, $content
 		while ( $instance_count < $instances && $processor->next_block() ) {
 			$matched_block_type = $processor->get_printable_block_type();
 			if ( str_starts_with( $matched_block_type, $prefix ) ) {
-				$blocks_content .= render_block( $processor->extract_block() );
+				$blocks_content .= render_block( $processor->extract_full_block_and_advance() );
 				++$instance_count;
 			}
 		}
 	} else {
 		// Scan for blocks of the exact block type.
 		while ( $instance_count < $instances && $processor->next_block( $block_name ) ) {
-			$blocks_content .= render_block( $processor->extract_block() );
+			$blocks_content .= render_block( $processor->extract_full_block_and_advance() );
 			++$instance_count;
 		}
 	}