Join Date: May 2005
Location: SJC
Programs: NZ*G, QF NB, UA 1K, AA ExecPlat, IHG PlatAmb, HHonors Gold, SPG Gold, Marriott Gold, ZE1 PC
Posts: 2,636
It's happened to me a couple of times on various airlines, including twice on CX. I've never had a problem with it (including immigration).
It seemed it happens often enough on CX that the first thing they tried when they "couldn't find my reservation" was reversing my names... Both times this was SIN-HKG-SIN.
I've also had it on SQ & QF (SIN-Australia or SIN-NZ), nobody commented - I think I only noticed when my miles didn't credit properly once.