Phone ext in profile edit messing with address

Using a profile with phone+ext field is messing with the contact address in edit mode.

To reproduce :

• create a profile with "Phone and Extension" on primary field and some primary address fields (street, city, country)
• use the profile in edit mode : e.g. http://example.com/civicrm/profile/view?reset=1&id=3&gid=1
• first time, with no phone and address data, every is fine. Second time, with already existing address in the database, the address is removed.