sourceMappingURL broken when using URL in publicPath

[gzzo]

Example webpack configuration:

import path from 'path'
import webpack from 'webpack'
import HtmlWebpackPlugin from 'html-webpack-plugin'
import InlineSourcePlugin from 'html-webpack-inline-source-plugin'

export default {
  context: path.resolve(__dirname, 'src'),

  entry: ['./index.js'],

  devtool: 'source-map',

  output: {
    publicPath: `https://my.cdn.com`,
    filename: '[name].[contenthash].js',
    path: path.resolve(__dirname, 'dist'),
  },

  optimization: {
    runtimeChunk: 'single',
    splitChunks: {
      cacheGroups: {
        vendors: false,
        vendor: {
          name: 'vendor',
          chunks: 'initial',
          test: /node_modules/,
          priority: 20,
        },
      },
    },
  },

  plugins: [
    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
    new HtmlWebpackPlugin({
      inlineSource: 'runtime.+\\.js',
    }),
    new InlineSourcePlugin(),
  ],

  resolve: {
    extensions: ['.js', '.jsx', '.scss'],
    modules: [
      path.resolve(__dirname, 'src'),
    ],
  },
}

Output index.html:

...
//# sourceMappingURL=https:/my.cdn.com/runtime.9a39f8dda0e7ff95bb67.js.map</script>

Note the single slash after https: