UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Steps to reproduce the problem:
1. create a manifest with start_url and scope as '/abc'
2. create a service worker in /abc with /abc/ scope
3. click on add to home screen in devtools

What is the expected behavior?
It shouldn;t throw the error

What went wrong?
Site cannot be installed: no matching service worker detected. You may need to reload the page, or check that the service worker for the current page also controls the start URL from the manifest

Did this work before? N/A 

Chrome version: 70.0.3538.77  Channel: stable
OS Version: OS X 10.12.6
Flash Version: 

Full description of the problem

So i want add to home screen on https://milliodollarwebsite/abc.

So my manifest is

{
  "short_name": "abc",
  "name": "abc",
  "icons": [
    {
      "src": "milliondollarpng",
      "type": "image/png",
      "sizes": "192x192"
    }
  ],
  "start_url": "/abc/",
  "background_color": "#FFF",
  "display": "standalone",
  "scope": "/abc/",
  "theme_color": "#FFF"
}

When i'm keeping my service worker file at /abc scoped to /abc/ i'm getting this error:

Site cannot be installed: no matching service worker detected. You may need to reload the page, or check that the service worker for the current page also controls the start URL from the manifest

But when i'm keeping my service worker file at root(/) scoped to / add to home screen is working fine. I don't want to keep service worker at the root directory.