Steps to reproduce:
- Go to Page settings and tick the box to make a redirect.
- Type in not just a page title, but also a section: Example#Foo
- Now what? If I click "Example" in the list, it deletes the #Foo part.
It turns out that if you click outside the page settings dialog, that it actually will accept this, but it looks impossible.
Then when you "apply changes", the redirect isn't visible on the page (T63861) so you can't tell whether it worked or did anything at all.