vscode extension store does not work

Describe the bug A clear and concise description of what the bug is.

Please confirm that this problem is VSCodium-specific

[x] This bug doesn't happen if I use Microsoft's Visual Studio Code. It only happens in VSCodium.

Please confirm that the issue/resolution isn't already documented

[ ] I checked the Docs page and the Troubleshooting page and my issue is not mentioned there.

I understand this isn't a supported usecase, but wanted to ask for sake of sanity check

I have this in ~/.config/VSCodium/product.json, but I can't fetch extensions

{
    "extensionsGallery": {
        "serviceUrl": "https://marketplace.visualstudio.com/_apis/public/gallery",
        "itemUrl": "https://marketplace.visualstudio.com/items",
        "cacheUrl": "https://vscode.blob.core.windows.net/gallery/index",
        "controlUrl": ""
    },
}

VSCodium / vscodium

vscode extension store does not work #1905