diff --git a/package_manager/tests/src/Build/TemplateProjectTestBase.php b/package_manager/tests/src/Build/TemplateProjectTestBase.php
index 2ea3e211..969f42bd 100644
--- a/package_manager/tests/src/Build/TemplateProjectTestBase.php
+++ b/package_manager/tests/src/Build/TemplateProjectTestBase.php
@@ -296,7 +296,13 @@ END;
     $packages = [];
     $drupal_root = $this->getDrupalRoot();
 
-    $core_packages = ['drupal/core-vendor-hardening', 'drupal/core-project-message'];
+    // @todo Add assertions that these packages never get added to vendor.json
+    //   and determine if this logic should removed in the core merge request in
+    //   https://drupal.org/i/3319679.
+    $core_packages = [
+      'drupal/core-vendor-hardening',
+      'drupal/core-project-message',
+    ];
     foreach ($this->getInstalledPackages() as $package) {
       $name = $package['name'];
       if (in_array($name, $core_packages, TRUE)) {