In the case of a wiki component defining an event listener which listens on events defined by an extension registered in the global namespace, it was noticed that the component fails to initialize properly upon the installation of another extension on the global namespace.

In the noticed case, the event defined by an extension registered in the global namespace is org.xwiki.contrib.oidc.event.OIDCUserUpdating, from the OIDC authenticator. The other extension installed on the global namespace is the CommonMark Markdown Syntax 1.2.

After the installation of CommonMark Markdown Syntax 1.2, once a new OIDC user logged in, it was not added in the mapped group in XWiki.