Are you using Sling Resource Merger ? Note : The Sling Resource Merger
and the related methods can only be used with Granite. This means that
creating an overlay with a skeleton structure is only appropriate for
the standard, touch-enabled UI. Refer:
https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/developing/full-stack/overlays.html?lang=en