E0722: Two routes on one URL through a route group

A route group, a folder in parentheses such as (console), adds nothing to the URL: the pages inside it are at the paths they would have without it. Two pages, or two endpoints of one method, end up at the same URL when the only thing between them is a group — one inside a group and one beside it, or one in each of two groups. Reported at one of them, naming both files.

Wrong

pages/admin/
  (console)/
    _layout.vuka.html          Shell: the admin area's shell
    auth/login.vuka.html       Login — /admin/auth/login
  auth/
    login.vuka.html            Login — /admin/auth/login

Right

pages/admin/
  (console)/
    _layout.vuka.html          Shell: the admin area's shell
    index.vuka.html            Index — /admin
  auth/
    login.vuka.html            Login — /admin/auth/login, outside the shell