It works fine when doing blind transfers or parking from within FOP2 itself. Attendant transfers makes asterisk report funky things on the manager port, including a channel termination event before the maskerading takes places. That is why the call disappears from the parking lot. You can use blind transfers or park from fop2 itself. I do not want to create a hacked fop2 server because it might lead to worst state inconsistencies in the future, like a forever parked call that is not there.