Publish subscription extension didn't add the metadata

azdev extension publish subscription --update-index

The index.json is updated:
{
"downloadUrl": "https://azurecliprod.blob.core.windows.net/cli-extensions/subscription-0.1.2-py2.py3-none-any.whl",
"filename": "subscription-0.1.2-py2.py3-none-any.whl",
"metadata": {
"classifiers": [
"Development Status :: 4 - Beta",
"Intended Audience :: Developers",
"Intended Audience :: System Administrators",
"Programming Language :: Python",
"Programming Language :: Python :: 2",
"Programming Language :: Python :: 2.7",
"Programming Language :: Python :: 3",
"Programming Language :: Python :: 3.4",
"Programming Language :: Python :: 3.5",
"Programming Language :: Python :: 3.6",
"License :: OSI Approved :: MIT License"
],
"extensions": {
"python.details": {
"contacts": [
{
"email": "wilcob@microsoft.com",
"name": "Wilco Bauwer",
"role": "author"
}
],
"document_names": {
"description": "DESCRIPTION.rst"
},
"project_urls": {
"Home": "https://github.com/Azure/azure-cli-extensions"
}
}
},
"generator": "bdist_wheel (0.30.0)",
"license": "MIT",
"metadata_version": "2.0",
"name": "subscription",
"summary": "Support for subscription management preview.",
"version": "0.1.2"
},
"sha256Digest": "58b7921f50b7860572971e8606239324293d289dd0d31b965ea23ff6e2650491"
}

But there are no minCliCoreVersion or maxCliCoreVersion although azext_metadata.json has.