BIM data issues in cesium

What is the type of bim data used in this Sandcastle example.I tried to load certain types of BIM data like IFC,RVZ,DWG by converting them to 3d tiles & after loading Its taking to some place and when i tried to zoom to that,page is getting crashed by showing error Invalid array length.What could be the reason.

I believe that BIM 3D Tiles data is exported directly from Bentley Systems’ MicroStation software.

Are you converting your BIM data to 3D Tiles with Cesium ion? If so, can you share a Sandcastle example using that asset with me? It might be a bug on our end.