$bean->emailAddress->addAddress is not working, and $sea->addAddress REMOVES all other addresses

I am writing an API to change an email address on a contact.
I don't want to remove the old address, just add the new one as primary on the Contact bean.

I used the documented addAddress ( support.sugarcrm.com/.../ )

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$contactBean->emailAddress->addAddress($new_email_address, true);
$contactBean->save();
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

$contactBean->emailAddress->addAddress($new_email_address, true);
$contactBean->save();

But this won't even add the new address to Contact at all. There are no errors in the logs, I verified that the contactBean is a valid Bean, and that the $new_email_address is a valid address. I checked the parameters for the addAddress function and I verified that the function is being called.

What's worse

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$sea = new SugarEmailAddress();
      $sea->addAddress($email_address,true);
      //do some checks...
      //add the email address to the Contact $bean
      $sea->save($bean->id, 'Contacts');
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

$sea = new SugarEmailAddress();
      $sea->addAddress($email_address,true);
      //do some checks...
      //add the email address to the Contact $bean
      $sea->save($bean->id, 'Contacts');

Adds the new address but DELETES all the others!

Has something changed in v11.0.1 (on site Professional) that I'm not aware of?

Thank you,
Francesca