CSS direct descendant not working properly on production build - css

Question

I suspect this is an issue with webpack, but I cannot seem to get this to work. My only CSS file (main.css) contains the following code:
.numpad > input {
text-align: center;
border: 2px solid blue;
margin: auto;
}
However when I publish the application, the CSS file shows the following:
.numpad {
text-align: center;
border: 2px solid blue;
margin: auto;
}
.numpad > input {
text-align: center;
border: 2px solid blue;
margin: auto;
}
I have searched the entire solution for any sort of duplicate that could be causing the first. It doesn't exist.
My webpack config is as follows:
module.exports = (env) => {
const isDevBuild = !(env && env.prod);
return [{
stats: { modules: false },
entry: { 'main': './ClientApp/boot.tsx' },
resolve: { extensions: ['.js', '.jsx', '.ts', '.tsx'] },
output: {
path: path.join(__dirname, bundleOutputDir),
filename: '[name].js',
publicPath: 'dist/'
},
devtool: 'inline-source-map',
module: {
rules: [
{ test: /\.tsx?$/, include: /ClientApp/, use: 'awesome-typescript-loader?silent=true' },
{ test: /\.css$/, use: isDevBuild ? ['style-loader', 'css-loader'] : ExtractTextPlugin.extract({ use: 'css-loader?minimize' }) },
{ test: /\.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' },
{ test: /\.js$/, include: /src/, exclude: /node_modules/, use: { loader: "babel-loader", options: { presets: ['env'] } } }
]
},
plugins: [
new CheckerPlugin(),
new webpack.DllReferencePlugin({
context: __dirname,
manifest: require('./wwwroot/dist/vendor-manifest.json')
}),
new CleanWebpackPlugin(['dist'])
].concat(isDevBuild ? [
// Plugins that apply in development builds only
new webpack.SourceMapDevToolPlugin({
filename: '[file].map', // Remove this line if you prefer inline source maps
moduleFilenameTemplate: path.relative(bundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
})
] : [
// Plugins that apply in production builds only
new webpack.optimize.UglifyJsPlugin(),
new ExtractTextPlugin('main.css')
])
}];
};
Any ideas for why there is a duplicate being created?