Project References won't work if extends config file

Background

ts-load version: 6.2.1
webpack version: 4.28.3
webpack-cli version: 3.3.10
tyepscript version: 3.7.2

Given the following config files:

1. tsconfig.json:

{
    "extends": "../tsconfig-global.json",
    "compilerOptions": {
        "outDir": "./dist",
        "strictNullChecks": false,
        "rootDir": "./src",
        "tsBuildInfoFile": "./tsconfig.tsbuildinfo"
    },
    "references": [{ "path": "../typescript-common" }],
    "include": ["./src"]
}

2. tsconfig-web.json (extends the TS config file above):

{
    "extends": "./tsconfig.json",
    "compilerOptions": {
        "lib": [
            "dom",
            "es5",
            "scripthost",
            "es2015.core",
            "es2015.promise",
            "es2017"
        ]
    }
}

3. Webpack config (use tsconfig-web.json to build TS code):

const path = require("path");
const webpack = require("webpack");
const TsconfigPathsPlugin = require("tsconfig-paths-webpack-plugin");

const configFile = path.resolve(__dirname, "../tsconfig-web.json");

module.exports = {
    entry: "./src/createTransformer.ts",
    mode: "production",
    output: {
        filename: "createTransformerForBrowser.js",
        path: path.join(__dirname, "..", "dist"),
        library: "createTransformer"
    },
    devtool: "source-map",
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                exclude: /node_modules/,
                loader: "ts-loader",
                options: {
                    configFile,
                    projectReferences: true
                }
            }
        ]
    },
    resolve: {
        plugins: [
            new TsconfigPathsPlugin({
                configFile
            })
        ],
        extensions: [".tsx", ".ts", ".js"]
    },
    node: {
        fs: "empty"
    }
};

Actual Behaviour

Project reference doesn't work. And you will find the following errors:

ERROR in xx/xx.ts
[tsl] ERROR in /xx/typescript-common/src/xxxxxx.ts(9,30)
      TS6059: File '/xx/typescript-common/src/xx/xx.ts' is not under 'rootDir' '/xx'. 'rootDir' is expected to contain all source files.

Expected Behaviour

Should build without error.

However, if you either:

• add "references": [{ "path": "../typescript-common" }], to tsconfig-web.json
• Or modify webpack.config.js to use tsconfig.json to build (instead of tsconfig-web.json)

the build will complete with no error.

Steps to Reproduce the Problem

See: https://github.com/t83714/sample-repo-ts-loader

Location of a Minimal Repository that Demonstrates the Issue.

https://github.com/t83714/sample-repo-ts-loader

Start with the linked sample-repo-ts-loader repository and reproduce the failure using webpack.config.js with tsconfig-web.json. Compare that build with the working configurations described in the issue, then trace how ts-loader handles project references inherited through the tsconfig extends chain. Done means the sample build completes without the TS6059 rootDir error.