Saulius Skeirys

Agree. It's coming from `last-call-webpack-plugin`. As updates are pending, possible solution could be to use [css-minimizer-webpack-plugin](https://www.npmjs.com/package/css-minimizer-webpack-plugin) package. _"Just like optimize-css-assets-webpack-plugin but more accurate with source maps and assets using query...

I had to downgrade to @3.22.0 in order to have it working. Other options did not help. 4.0.0 is not stable.