How to cancel verify the old email address

Can you help me understand your steps? I usually struggle to change the e-mail address of my test accounts. So I tried what you described with an anonymized test account.

  1. Change email in the preferences
    → a new unverified email is added
  2. Disable and enable the account
    → old email is verified, new one is still unconfirmed

What is the step I am missing to confirm the new email?

I also tried to deactivate the user before changing the email. That didn’t work either