Referral doesn't work when user alias is changed

For example:

I am using Path auto, Configured that each user will get automatic alias which is [user-raw]

example: user with the name "Dani" would get example.com/Dani alias and so on.

When annoymous user visit Dani profile page (example.com/Dani) and decided to register, Dani doesn't get any referral credit for that registration.