diff --git a/src/wp-includes/block-template-utils.php b/src/wp-includes/block-template-utils.php
index 88bda858f06a8..438556a7b9df5 100644
--- a/src/wp-includes/block-template-utils.php
+++ b/src/wp-includes/block-template-utils.php
@@ -411,7 +411,7 @@ function _add_block_template_info( $template_item ) {
 		return $template_item;
 	}
 
-	$theme_data = WP_Theme_JSON_Resolver::get_theme_data( array(), array( 'with_supports' => false ) )->get_custom_templates();
+	$theme_data = wp_get_theme_data_custom_templates();
 	if ( isset( $theme_data[ $template_item['slug'] ] ) ) {
 		$template_item['title']     = $theme_data[ $template_item['slug'] ]['title'];
 		$template_item['postTypes'] = $theme_data[ $template_item['slug'] ]['postTypes'];
diff --git a/src/wp-includes/global-styles-and-settings.php b/src/wp-includes/global-styles-and-settings.php
index 0f1ca5c82bb59..17ff41d002214 100644
--- a/src/wp-includes/global-styles-and-settings.php
+++ b/src/wp-includes/global-styles-and-settings.php
@@ -441,6 +441,18 @@ function wp_get_theme_directory_pattern_slugs() {
 	return WP_Theme_JSON_Resolver::get_theme_data( array(), array( 'with_supports' => false ) )->get_patterns();
 }
 
+/**
+ * Returns the metadata for the custom templates defined by the theme via theme.json.
+ *
+ * @since 6.4.0
+ *
+ * @return array Associative array of `$template_name => $template_data` pairs,
+ *               with `$template_data` having "title" and "postTypes" fields.
+ */
+function wp_get_theme_data_custom_templates() {
+	return WP_Theme_JSON_Resolver::get_theme_data( array(), array( 'with_supports' => false ) )->get_custom_templates();
+}
+
 /**
  * Returns the metadata for the template parts defined by the theme.
  *