Index: wp-includes/post.php
===================================================================
--- wp-includes/post.php	(revision 22261)
+++ wp-includes/post.php	(working copy)
@@ -389,7 +389,6 @@
 	} elseif ( is_object( $post ) ) {
 		if ( empty( $post->filter ) ) {
 			$_post = sanitize_post( $post, 'raw' );
-			wp_cache_add( $post->ID, $_post, 'posts' );
 			$_post = new WP_Post( $_post );
 		} elseif ( 'raw' == $post->filter ) {
 			$_post = new WP_Post( $post );