UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Steps to reproduce the problem:
1. Host any ES6 Module (eg: https://example.com/mymodule.js) 
2. Open DevTools on example.com, create a new Snippet:

(async _ => {
  const MyModule = await import('./mymodule.js');
});

3. Run the snippet

What is the expected behavior?
The module should be imported, because the snippet should be executed within the page origin and should therefore have access to that relative module identifier.

This worked fine up until and including Chrome 69.

I couldn't find any notes as to why it would stop working in v70.

Also reproducable in Beta (71.0.3578.20)

What went wrong?
The dynamic import fails:

TypeError: Failed to resolve module specifier './mymodule.js' 
at snippet:///TestSnippet:2:33

Did this work before? Yes 69

Chrome version: 70.0.3538.77  Channel: stable
OS Version: 10.0
Flash Version: