Bugs in the editor - does not save material side

After exporting the model, the editor does not save the side material. I set [ Back side ] but after export material stay [ Front side ]

How do you export the model? It seems the three.js JSON format honors the side property as expected.

see GLTFExporter ignores material.side: 1 (backside) - #2 by donmccurdy

If you need a format that fully restores material properties, it’s best to use the three.js JSON format. Is that an option for you?

Got it, thanks, I’ll take that into account.

I have one more question, why this is not saved

Are you performing the glTF export again? Or you asking the question in context of JSON?

Yes, gltf export