Try to update the viewer documents as below viewer3D: "https://developer.api.autodesk.com/modelderivative/v2/viewers/viewer3D.min.js?v=v7.104", style: "https://developer.api.autodesk.com/modelderivative/v2/viewers/style.min.css?v=v7.104",
In my case, it was solved after updating the latest version.