DefaultRouter fails to create proper URL because of str_replace.

When you try to generate URL (ie. Twig: url('some.route')) that is SiteAccess aware it will generate incorrect URL if:

• URIElement: 1 matcher is used (and probably any other URI related matcher) and
• route path is same as beginning of the host, ie:

  # Hostname: ezplatform.com
  # SiteAccess: example
  
  # routing.yml:
  some.route:
      path: /ezplatform
  

  Expected URL: http://ezplatform.com/example/ezplatform
  Result URL: http://example/ezplatform.com/example/ezplatform

Explanation: It tries to replace any occurence of /ezplatform with /example/ezplatform in base URL: http://ezplatform.com/ezplatform.

(If you try to generate route with path: /, it will replace every slash in URL with SiteAccess name, ie: http:/example//example/ezplatform.com/example/)

Edit: Probably duplicate of: https://jira.ez.no/browse/EZP-28099 (Seems similar, put probably different issue)