diff --git a/packages/block-library/src/post-template/index.php b/packages/block-library/src/post-template/index.php
index 3a3c207cf92ee..779abf4c17bdb 100644
--- a/packages/block-library/src/post-template/index.php
+++ b/packages/block-library/src/post-template/index.php
@@ -78,24 +78,22 @@ function render_block_core_post_template( $attributes, $content, $block ) {
 	while ( $query->have_posts() ) {
 		$query->the_post();
 
-		// Get an instance of the current Post Template block.
-		$block_instance = $block->parsed_block;
-
 		// Set the block name to one that does not correspond to an existing registered block.
 		// This ensures that for the inner instances of the Post Template block, we do not render any block supports.
-		$block_instance['blockName'] = 'core/null';
-
+		$block->name = 'core/null';
+
+		$post_id              = get_the_ID();
+		$post_type            = get_post_type();
+		$filter_block_context = static function( $context ) use ( $post_id, $post_type ) {
+			$context['postType'] = $post_type;
+			$context['postId']   = $post_id;
+			return $context;
+		};
+		add_filter( 'render_block_context', $filter_block_context );
 		// Render the inner blocks of the Post Template block with `dynamic` set to `false` to prevent calling
 		// `render_callback` and ensure that no wrapper markup is included.
-		$block_content = (
-			new WP_Block(
-				$block_instance,
-				array(
-					'postType' => get_post_type(),
-					'postId'   => get_the_ID(),
-				)
-			)
-		)->render( array( 'dynamic' => false ) );
+		$block_content = $block->render( array( 'dynamic' => false ) );
+		remove_filter( 'render_block_context', $filter_block_context );
 
 		// Wrap the render inner blocks in a `li` element with the appropriate post classes.
 		$post_classes = implode( ' ', get_post_class( 'wp-block-post' ) );