Data Point
CX; BKK-SIN; Business Essential (BA > QF)
Entered BA FFP number, got paper BP with BA FFP number (OWE).
Changed to QF number (no status) at gate via CX app. Boarded as OWE on the basis of paper BP.
Points and SC credited to QF on clockwork on Tuesday (the day that CX flights get credited to QFF).
Have another 4 flights on CX this and next week that I'll have to do the switcharoo so will confirm what happens with those 4 segments.