storybook: Addon-docs: hot module replacement throws error

Describe the bug I am using storybook for angular. Since I installed the addon-docs and created my first mdx file, the hot moddule replacement crashes with following error

Unhandled Promise rejection: Manifest request to b3fa85f7c6693e1eaa33.hot-update.json timed out. ; Zone: <root> ; Task: Promise.then ; Value: Error: Manifest request to b3fa85f7c6693e1eaa33.hot-update.json timed out.
at XMLHttpRequest.request.onreadystatechange [as __zone_symbol__ON_PROPERTYreadystatechange] (runtime~main.b3fa85f7c6693e1eaa33.bundle.js:sourcemap:91)
    at XMLHttpRequest.wrapFn (vendors~main.b3fa85f7c6693e1eaa33.bundle.js:sourcemap:208211)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (vendors~main.b3fa85f7c6693e1eaa33.bundle.js:sourcemap:207302)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (vendors~main.b3fa85f7c6693e1eaa33.bundle.js:sourcemap:207074)
    at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (vendors~main.b3fa85f7c6693e1eaa33.bundle.js:sourcemap:207377)
    at invokeTask (vendors~main.b3fa85f7c6693e1eaa33.bundle.js:sourcemap:208623)
    at XMLHttpRequest.globalZoneAwareCallback (vendors~main.b3fa85f7c6693e1eaa33.bundle.js:sourcemap:208649) Error: Manifest request to b3fa85f7c6693e1eaa33.hot-update.json timed out.
    at XMLHttpRequest.request.onreadystatechange [as __zone_symbol__ON_PROPERTYreadystatechange] (http://localhost:6006/runtime~main.b3fa85f7c6693e1eaa33.bundle.js:91:16)
    at XMLHttpRequest.wrapFn (http://localhost:6006/vendors~main.b3fa85f7c6693e1eaa33.bundle.js:208211:39)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (http://localhost:6006/vendors~main.b3fa85f7c6693e1eaa33.bundle.js:207302:31)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (http://localhost:6006/vendors~main.b3fa85f7c6693e1eaa33.bundle.js:207074:47)
    at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (http://localhost:6006/vendors~main.b3fa85f7c6693e1eaa33.bundle.js:207377:34)
    at invokeTask (http://localhost:6006/vendors~main.b3fa85f7c6693e1eaa33.bundle.js:208623:14)
    at XMLHttpRequest.globalZoneAwareCallback (http://localhost:6006/vendors~main.b3fa85f7c6693e1eaa33.bundle.js:208649:17)

To Reproduce Steps to reproduce the behavior:

1. Set up storybook for angular
2. Install and configure addon-docs
3. Create mdx

Expected behavior Hot module replacement should work.

System:

• OS: MacOS
• Device: Macbook Pro 2018
• Browser: chrome
• Framework: angular
• Addons: docs
• Version: 5.2.0-alpha.3