Lines are not visible after export .babylon

I export scene from playground below with inspector to .babylon.
Then, I upload it to sandbox.babylonjs.com and I see no lines.
Tho, they are visible in sandbox’es inspector.
With .glb exort it’s okey
https://www.babylonjs-playground.com/#N6D2NZ#8

It’s a bug, I have filed an issue:

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