How to properly display a gltf model with negative scale in a group?

Hi, I using three.js @r110 to load this model, but it did not display properly

And in babylonjs sandbox it looks right

How can I fix this problem?

flip.gltf (28.4 KB)

Um, when loading the file into babylon sandbox it looks actually like so:

sorry,I upload the wrong file, need to double side materials doubleflip.gltf (28.5 KB)

Okay, now I can reproduce. It seems this visual glitch happens because of the following issue:

It would be great if you can leave a post at github so everyone knows you have also faced this bug.

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thank you.