diff --git a/src/Umbraco.Web.UI.Client/web-test-runner.config.mjs b/src/Umbraco.Web.UI.Client/web-test-runner.config.mjs
index 7e570f0e20..a3df3aa007 100644
--- a/src/Umbraco.Web.UI.Client/web-test-runner.config.mjs
+++ b/src/Umbraco.Web.UI.Client/web-test-runner.config.mjs
@@ -12,7 +12,7 @@ if (!['dev', 'prod'].includes(mode)) {
 	throw new Error(`MODE must be "dev" or "prod", was "${mode}"`);
 }
 
-const silencedLogs = ['Lit is in dev mode.', 'Multiple versions of Lit loaded.'];
+const silencedLogs = ['Lit is in dev mode.', 'Multiple versions of Lit loaded.', '-- Extension of alias "', 'Error: Failed to create extension api from alias'];
 
 /** @type {import('@web/dev-server').DevServerConfig} */
 export default {