Yes, it's using the MSFT_lod extension, which is really only supported in Microsoft tools. Although, I can't quite tell what that's doing here – it looks like there's only one mesh, so maybe the LODs just affect the material?
It could also be that the original file had a subdivision modifier on it, which got lost somewhere in conversion.
/cc @bghgary should MSFT_sRGBFactors extensions be included in these exports?
Yea the msft_lod seems to be for texture resolution
should MSFT_sRGBFactors extensions be included in these exports?
This was used for backwards compatibility when some of our implementations were doing the wrong thing. This is no longer relevant. We will stop writing this out eventually, but it should be harmless.
Well, seems there is no action on blender importer/exporter here. Closing this ticket