I have exactly the same issue.
when unconfirmed user clicks confirmation link it still stays unconfirmed, and URL redirects to subpage with generated code appended.
Confirmation mail is sent, but user is still not confirmed. Unsubscription doesn’t work either.
If I want to visit profile url, it again redirects to same subpage with generated code in the end.
This GDPR and stuff is killing me. 🙁