diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index 93ff0f7aaa..49b26cd5b6 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -1287,12 +1287,22 @@ add_filter( 'block_type_metadata', '_wp_multiple_block_styles' );
 function build_comment_query_vars_from_block( $block ) {
 
 	$comment_args = array(
-		'orderby'                   => 'comment_date_gmt',
-		'order'                     => 'ASC',
-		'status'                    => 'approve',
-		'no_found_rows'             => false,
+		'orderby'       => 'comment_date_gmt',
+		'order'         => 'ASC',
+		'status'        => 'approve',
+		'no_found_rows' => false,
 	);
 
+	if ( is_user_logged_in() ) {
+		$comment_args['include_unapproved'] = array( get_current_user_id() );
+	} else {
+		$unapproved_email = wp_get_unapproved_comment_author_email();
+
+		if ( $unapproved_email ) {
+			$comment_args['include_unapproved'] = array( $unapproved_email );
+		}
+	}
+
 	if ( ! empty( $block->context['postId'] ) ) {
 		$comment_args['post_id'] = (int) $block->context['postId'];
 	}
diff --git a/tests/phpunit/tests/blocks/renderCommentTemplate.php b/tests/phpunit/tests/blocks/renderCommentTemplate.php
index 6267838904..456e5ec145 100644
--- a/tests/phpunit/tests/blocks/renderCommentTemplate.php
+++ b/tests/phpunit/tests/blocks/renderCommentTemplate.php
@@ -250,4 +250,46 @@ class Tests_Blocks_RenderReusableCommentTemplate extends WP_UnitTestCase {
 			$block->render()
 		);
 	}
+
+	/**
+	 * Test that unapproved comments are included if it is a preview.
+	 *
+	 * @ticket 55634
+	 * @covers ::build_comment_query_vars_from_block
+	 */
+	function test_build_comment_query_vars_from_block_with_comment_preview() {
+		$parsed_blocks = parse_blocks(
+			'<!-- wp:comment-template --><!-- wp:comment-author-name /--><!-- wp:comment-content /--><!-- /wp:comment-template -->'
+		);
+
+		$block = new WP_Block(
+			$parsed_blocks[0],
+			array(
+				'postId' => self::$custom_post->ID,
+			)
+		);
+
+		$commenter_filter = function () {
+			return array(
+				'comment_author_email' => 'unapproved@example.org',
+			);
+		};
+
+		add_filter( 'wp_get_current_commenter', $commenter_filter );
+
+		$this->assertEquals(
+			build_comment_query_vars_from_block( $block ),
+			array(
+				'orderby'            => 'comment_date_gmt',
+				'order'              => 'ASC',
+				'status'             => 'approve',
+				'no_found_rows'      => false,
+				'include_unapproved' => array( 'unapproved@example.org' ),
+				'post_id'            => self::$custom_post->ID,
+				'hierarchical'       => 'threaded',
+				'number'             => 5,
+				'paged'              => 1,
+			)
+		);
+	}
 }