Angular router include extra segment to the path when useHash is enabled

Question

I have an angular application deployed under an URL looks like this:

https://example.com/my-angular-application

This is a requirement in my project to use hash routing so I set useHash: true

In case if I start the application and my default route is /abcd I would expect the URL to look like this:

https://example.com/my-angular-application/#/abcd

But instead of this I got:

https://example.com/my-angular-application/#/my-angular-application/abcd

What can cause this behaviour?

I've tried to use redirect to resolve this but it did not help.