May be I'm overthinking this, but does anyone have any experience with doing OLCI with a foreign passport but go through BKK exit immigration with a Thai passport? (I'm going to enter with a Thai passport so definitely can't exit with a foreign one.)

Last time I flew out to HND I skipped OLCI and checked in at the airport, the check in guy specifically asked if I want to use different passport to exit BKK than to enter Japan and to this day I still don't know if he did anything special.