diff --git a/sync/class.jetpack-sync-module-posts.php b/sync/class.jetpack-sync-module-posts.php
index 8c68b16752ee4..6d19b39df543e 100644
--- a/sync/class.jetpack-sync-module-posts.php
+++ b/sync/class.jetpack-sync-module-posts.php
@@ -280,6 +280,24 @@ public function save_published( $new_status, $old_status, $post ) {
 		$this->previous_status[ $post->ID ] = $old_status;
 	}
 
+	/*
+	 * When publishing or updating a post, the Gutenberg editor sends two requests:
+	 * 1. sent to WP REST API endpoint `wp-json/wp/v2/posts/$id`
+	 * 2. sent to wp-admin/post.php `?post=$id&action=edit&classic-editor=1&meta_box=1`
+	 *
+	 * The 2nd request is to update post meta, which is not supported on WP REST API.
+	 * When syncing post data, we will include if this was a meta box update.
+	 */
+	public function is_gutenberg_meta_box_update() {
+		return (
+			isset( $_POST['action'], $_GET['classic-editor'], $_GET['meta_box'] ) &&
+			'editpost' === $_POST['action'] &&
+			'1' === $_GET['classic-editor'] &&
+			'1' === $_GET['meta_box'] &&
+			Jetpack::is_gutenberg_available()
+		);
+	}
+
 	public function wp_insert_post( $post_ID, $post = null, $update = null ) {
 		if ( ! is_numeric( $post_ID ) || is_null( $post ) ) {
 			return;
@@ -301,7 +319,8 @@ public function wp_insert_post( $post_ID, $post = null, $update = null ) {
 		$state = array(
 			'is_auto_save' => (bool) Jetpack_Constants::get_constant( 'DOING_AUTOSAVE' ),
 			'previous_status' => $previous_status,
-			'just_published' => $just_published
+			'just_published' => $just_published,
+			'is_gutenberg_meta_box_update' => $this->is_gutenberg_meta_box_update(),
 		);
 		/**
 		 * Filter that is used to add to the post flags ( meta data ) when a post gets published
diff --git a/tests/php/sync/test_class.jetpack-sync-posts.php b/tests/php/sync/test_class.jetpack-sync-posts.php
index d38ec22b79405..780e86f5fab8d 100644
--- a/tests/php/sync/test_class.jetpack-sync-posts.php
+++ b/tests/php/sync/test_class.jetpack-sync-posts.php
@@ -113,6 +113,17 @@ public function test_delete_post_syncs_event() {
 		$this->assertEquals( $this->post->ID, $event->args[0] );
 	}
 
+	public function test_update_post_includes_gutenberg_info_in_state() {
+		$this->post->post_content = "Updated using classic editor";
+
+		wp_update_post( $this->post );
+
+		$this->sender->do_sync();
+		$event = $this->server_event_storage->get_most_recent_event( 'jetpack_sync_save_post' );
+
+		$this->assertEquals( false, $event->args[3]['is_gutenberg_meta_box_update'] );
+	}
+
 	public function test_update_post_updates_data() {
 		$this->post->post_content = "foo bar";