Never mind, this is properly documented in the registrar module docs:
> A call to lookup(...) always uses the path header if found, and inserts it as
> Route HF either in front of the first Route HF, or after the last Via HF if
> no Route is present. It also sets the destination uri to the first Path uri,
> thus overwriting the received-uri, because NAT has to be handled at the
> outbound-proxy of the UAC (the first hop after client's NAT).
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