This is the code with right check depending on the scope is: https://github.com/xwiki/xwiki-platform/blob/6d40ed311bcbc6ea5b3fd9197d400653e919b8a8/xwiki-platform-core/xwiki-platform-uiextension/xwiki-platform-uiextension-api/src/main/java/org/xwiki/uiextension/internal/WikiUIExtensionComponentBuilder.java#L90