Ah, now I remember. Last year I did book by Lufthansa's homepage a trip from Hong Kong to Germany. Lufthansa did put me on a CX flight to PVG, then by LH to FRA.

That time I thought it was strange that I did not get miles for this segment. CS explained the reason "not eligible for mileage credit, as there is no Lufthansa codeshare flight number on these flights".

I did fly with cx364. Lesson learned! But didn't matter much last year, but this year I'm going for FTL so need to get in the points.