Upon install site stops working due to too many redirects

Had the same issue, this happens if you don't configure the langcode for the single
language in system, which is located at admin/config/regional/language/detection/url , you need to add a prefix for the default language.

I'm also adding a patch that fixes the error, since its a fatal error if user doesn't configure that, so we need to add a check before adding a path prefix.