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 06db540af2..e4a8bcba86 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
@@ -1344,8 +1344,10 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		}
 
 		if ( $request['id'] ) {
+			$post             = get_post( $request['id'] );
 			$current_template = get_page_template_slug( $request['id'] );
 		} else {
+			$post             = null;
 			$current_template = '';
 		}
 
@@ -1355,7 +1357,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		}
 
 		// If this is a create request, get_post() will return null and wp theme will fallback to the passed post type.
-		$allowed_templates = wp_get_theme()->get_page_templates( get_post( $request['id'] ), $this->post_type );
+		$allowed_templates = wp_get_theme()->get_page_templates( $post, $this->post_type );
 
 		if ( isset( $allowed_templates[ $template ] ) ) {
 			return true;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index e096c3a327..1e1aa02e41 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-beta1-49300';
+$wp_version = '5.6-beta1-49301';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.