Steps to Reproduce:
- Activate newcomer's homepage.
- Visit a subpage of your user page (doesn't have to exist).
- Click Discussion at the top of the page.
(Specific links not provided because this issue is user-specific.)
You are redirected to your talk page (not the talk page of the subpage).
I believe this isn't correct. Such talk pages can be created, e.g. as feedback to a draft article. Now it's quite difficult to reach it without typing its (potentially long) name.
You are redirected to the talk page of the subpage (whether it exists or not).