I just did an import (to verify weird behavior reported by a client), matching on first, last and email, with Update checked. The system has home set as default location type (=1). The contact had only one email and was set to "Govt" (a custom setting of location type =6) and since was the only email, was the primary. On import, with the email in the mapping set to Primary, the correct contact was matched, but the result was a duplicate email created of type Billing (=5). When inspecting the civicrm_email table the location_type_id=0 though (no setting for id=0)!
The primary email setting was not changed for my test, but examining the detailed log tables for their import, timestamps show the primary email was changed from the existing primary to the newly created billing email simultaneously (again contact record shows billing, but civicrm_email table shows location_type_id=0)!
Has anyone experienced this kind of behavior? I would expect the primary email to be updated no matter what location type, no?
Running Civi 4.7.23 in Drupal
