Looking at the All-Users repo it looks like gerrit added a mailto: externalId to your account and subsequently removed the gerrit: externalId for your account.

Did you update your preferred email address recently, by chance?

In T230235#5406396, @thcipriani wrote:

@Viztor this should be resolved for you, please re-open if that is not the case.

Also, let me know if you changed any email preferences recently: I'm not sure how this happened and I wasn't able to recreate in my testing.

Yeah. It worked. I did changed the email address registered in Gerrit, though I had no idea what it did behind the scene. Thanks for the help <3

I don't recall in any case where email is used as ID in gerrit. It always seem to be the username, I can't think of a way how could this have happened either...