sideEffects in antd package.json not working as expected

Question

We are using lib/styles/.css file from antd/lib in one our project files. In production build same is not shipped even when antd/package.json defines files at provided location to be sideEffects.

We have tried to set sideEffects: true for all CSS files being picked up from node_modules for CSSLoader in Webpack config's module.rules.

Import statement-

import 'antd/lib/grid/style/index.css';

sideEffects definition in antd/package.json

[
  "dist/*",
  "es/**/style/*",
  "lib/**/style/*",
  "*.less",
]

CSSLoader Rules defined as part of our effort to mark required file as sideEffects-

{
  include: [/node_modules/],
  sideEffects: true,
}

The CSS file imported from antd is not present in production bundles.

P.S. No error message is displayed