Error Exporting GLB format

I am trying to export the BoomBox.glb file in glb format and drop it on Sandbox. The mesh is ruined after export.

The same applies when exporting the glb file to gltf format.
Works fine when importing a gltf file and exporting it in gltf format.

pinging @bghgary and @Drigax

It is there actually but really small as you are incorporating the environment in it.

Also you are exporting when the meshes are not ready. Fix: