http://localhost:8080/test/_wrapped-content.html?contentId=defaultWebContent://50cbc9a4-f8b7-4a0a-afc4-82b93f233674

leads to

org.apache.cocoon.ResourceNotFoundException : No pipeline matched request: _plugins/newsletter/org.ametys.plugins.newsletter.Content.newsletter.
<map:mount> - resource://org/ametys/runtime/kernel/sitemap.xmap - 141 : 82