Use the 5.x version to compare, this model has textures. Textures are still displayed normally in version 6.3
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cc @Deltakosh, maybe it’s related to the PR that adds support for line meshes?
Seems very unlikely. Isn’t it a network issue?
It’s not a network problem, the texture has the correct request, and it is normal to reduce the version rendering
Actually you are right it was a bug
usemtl was capture by the regex looking for “l x y”
Fixed here: Fix mtl loader being ignored by deltakosh · Pull Request #13950 · BabylonJS/Babylon.js (github.com)
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Who uses mtl in BJS anyways? 
There are just too many limitations for my taste. 