sass-loader@6.0.0 source-map issue

webpack.config.js

"use strict";

const path = require("path");
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const sassLoader = require.resolve("../../lib/loader");

const extractSass = new ExtractTextPlugin({
    filename: "[name].[contenthash].css",
    disable: false
});

module.exports = {
    entry: path.resolve(__dirname, "../scss/bootstrap-sass.scss"),
    output: {
        path: path.resolve(__dirname, "../output"),
        filename: "bundle.bootstrap-sass.js"
    },
    devtool: "source-map",
    module: {
        rules: [{
            test: /\.scss$/,
            use: extractSass.extract({
                loader: [{
                    loader: "css-loader",
                    options: {
                        sourceMap: true
                    }
                }, {
                    loader: 'adjust-sourcemap-loader', options: {
                        debug: true,
                        format: false//'absolute'
                    }
                }, {
                    loader: sassLoader,
                    options: {
                        sourceMap: true,
                        includePaths: [
                            path.resolve(__dirname, "../scss/from-include-path")
                        ]
                    }
                }],
                fallbackLoader: "style-loader"
            })
        }, {
            test: /\.woff2?$|\.ttf$|\.eot$|\.svg$/,
            use: [{
                loader: "file-loader"
            }]
        }]
    },
    plugins: [
        extractSass
    ]
};