Event Registration (with PayPal Std) - Extraneous Contact Record is Created

When registering for an event using PayPal Standard, the code creates an EXTRA contact. Pretty sure this happens when the IPN comes in - as the "additional" contact carries the PayPal Account Name . (The first created contact has the contribution and participant record, as well as the required email address attached to it - as it should.)

As a side note, we actually override the user-entered First and Last Name with the PayPal Account "name" on the initially created contact record (this applies to cases where there is a profile w/ first and last in the registration page). This seems a bit weird - since we are also inserting the extraneous contact w/ that first/last name.

You can recreate this bug using this event in test mode.
http://sandbox.devel.civicrm.org/civicrm/event/register?reset=1&action=preview&id=2

I did it as anonymous user - the behavior might be different/correct if the registration is done by an existing, logged in user/contact.

• • • I tested the same scenario with a Contribution - also anonymous - (civicrm/contribute/transact?id=1&reset=1&action=preview) - and this bug did NOT occur.