If the apple id has an email changed to another, will the old email remain somehow tied to this apple id?

Question

Apple ID

If the apple id has an email changed to another, will the old email remain somehow tied to this apple id?
For example, if you unlink the linked phone number in your yahoo account, the number will still remain linked to this account, although this is not specified in the settings.
This becomes apparent when using the "forgot my password" feature. In this case, yahoo offers to restore access to the account using the phone number that was unlinked. Although this should not be.