This issue is not reproducible in ArcGIS Online. If the issue occurs, please contact Esri Support Services as additional information is required for further investigation.
解决办法
In ArcGIS Pro, create a global scene and add the LAS dataset to the scene.
Share the scene to ArcGIS Online. The dataset's coordinate system is transformed on the fly to WGS 1984 Web Mercator (Auxiliary Sphere) and the basemap is correctly drawn. The basemap can be changed to any other basemap.