diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index cb2cd060dd..fbf11b3ded 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -687,13 +687,13 @@ function get_default_post_to_edit( $post_type = 'post', $create_in_db = false )
 				'post_status' => 'auto-draft',
 			),
 			false,
-			true
+			false
 		);
 		$post    = get_post( $post_id );
 		if ( current_theme_supports( 'post-formats' ) && post_type_supports( $post->post_type, 'post-formats' ) && get_option( 'default_post_format' ) ) {
 			set_post_format( $post, get_option( 'default_post_format' ) );
 		}
-		wp_after_insert_post( $post, false );
+		wp_after_insert_post( $post, false, null );
 
 		// Schedule auto-draft cleanup.
 		if ( ! wp_next_scheduled( 'wp_scheduled_auto_draft_delete' ) ) {
diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index a46b97fa5a..ff433fe5db 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -3105,7 +3105,7 @@ final class WP_Customize_Manager {
 		/** This action is documented in wp-includes/post.php */
 		do_action( 'wp_insert_post', $post->ID, $post, true );
 
-		wp_after_insert_post( $post, true );
+		wp_after_insert_post( get_post( $post_id ), true, $post );
 
 		wp_trash_post_comments( $post_id );
 
diff --git a/wp-includes/post.php b/wp-includes/post.php
index 5ebd80f79d..a78b266a12 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -3717,6 +3717,7 @@ function wp_insert_post( $postarr, $wp_error = false, $fire_after_hooks = true )
 		$previous_status = get_post_field( 'post_status', $post_ID );
 	} else {
 		$previous_status = 'new';
+		$post_before     = null;
 	}
 
 	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];
@@ -4319,7 +4320,7 @@ function wp_insert_post( $postarr, $wp_error = false, $fire_after_hooks = true )
 	do_action( 'wp_insert_post', $post_ID, $post, $update );
 
 	if ( $fire_after_hooks ) {
-		wp_after_insert_post( $post, $update );
+		wp_after_insert_post( $post, $update, $post_before );
 	}
 
 	return $post_ID;
@@ -4432,6 +4433,8 @@ function wp_publish_post( $post ) {
 		return;
 	}
 
+	$post_before = get_post( $post->ID );
+
 	// Ensure at least one term is applied for taxonomies with a default term.
 	foreach ( get_object_taxonomies( $post->post_type, 'object' ) as $taxonomy => $tax_object ) {
 		// Skip taxonomy if no default term is set.
@@ -4482,7 +4485,7 @@ function wp_publish_post( $post ) {
 	/** This action is documented in wp-includes/post.php */
 	do_action( 'wp_insert_post', $post->ID, $post, true );
 
-	wp_after_insert_post( $post, true );
+	wp_after_insert_post( $post, true, $post_before );
 }
 
 /**
@@ -4937,10 +4940,12 @@ function wp_transition_post_status( $new_status, $old_status, $post ) {
  *
  * @since 5.6.0
  *
- * @param int|WP_Post $post   The post ID or object that has been saved.
- * @param bool        $update Whether this is an existing post being updated.
+ * @param int|WP_Post  $post        The post ID or object that has been saved.
+ * @param bool         $update      Whether this is an existing post being updated.
+ * @param null|WP_Post $post_before Null for new posts, the WP_Post object prior
+ *                                  to the update for updated posts.
  */
-function wp_after_insert_post( $post, $update ) {
+function wp_after_insert_post( $post, $update, $post_before ) {
 	$post = get_post( $post );
 	if ( ! $post ) {
 		return;
@@ -4953,11 +4958,13 @@ function wp_after_insert_post( $post, $update ) {
 	 *
 	 * @since 5.6.0
 	 *
-	 * @param int     $post_id Post ID.
-	 * @param WP_Post $post    Post object.
-	 * @param bool    $update  Whether this is an existing post being updated.
+	 * @param int          $post_id     Post ID.
+	 * @param WP_Post      $post        Post object.
+	 * @param bool         $update      Whether this is an existing post being updated.
+	 * @param null|WP_Post $post_before Null for new posts, the WP_Post object prior
+	 *                                  to the update for updated posts.
 	 */
-	do_action( 'wp_after_insert_post', $post_id, $post, $update );
+	do_action( 'wp_after_insert_post', $post_id, $post, $update, $post_before );
 }
 
 //
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index fcbf70f501..3eb0490960 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -191,7 +191,7 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 		 */
 		do_action( 'rest_after_insert_attachment', $attachment, $request, true );
 
-		wp_after_insert_post( $attachment, false );
+		wp_after_insert_post( $attachment, false, null );
 
 		if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
 			// Set a custom header with the attachment_id.
@@ -321,7 +321,8 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 			);
 		}
 
-		$response = parent::update_item( $request );
+		$attachment_before = get_post( $request['id'] );
+		$response          = parent::update_item( $request );
 
 		if ( is_wp_error( $response ) ) {
 			return $response;
@@ -347,7 +348,7 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php */
 		do_action( 'rest_after_insert_attachment', $attachment, $request, false );
 
-		wp_after_insert_post( $attachment, true );
+		wp_after_insert_post( $attachment, true, $attachment_before );
 
 		$response = $this->prepare_item_for_response( $attachment, $request );
 		$response = rest_ensure_response( $response );
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index c168d8993c..a052d04964 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -677,7 +677,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		 */
 		do_action( "rest_after_insert_{$this->post_type}", $post, $request, true );
 
-		wp_after_insert_post( $post, false );
+		wp_after_insert_post( $post, false, null );
 
 		$response = $this->prepare_item_for_response( $post, $request );
 		$response = rest_ensure_response( $response );
@@ -753,7 +753,8 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			return $valid_check;
 		}
 
-		$post = $this->prepare_item_for_database( $request );
+		$post_before = get_post( $request['id'] );
+		$post        = $this->prepare_item_for_database( $request );
 
 		if ( is_wp_error( $post ) ) {
 			return $post;
@@ -830,7 +831,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
 		do_action( "rest_after_insert_{$this->post_type}", $post, $request, false );
 
-		wp_after_insert_post( $post, true );
+		wp_after_insert_post( $post, true, $post_before );
 
 		$response = $this->prepare_item_for_response( $post, $request );
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0c09433680..01bf49f56d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-RC1-49730';
+$wp_version = '5.6-RC1-49732';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.