[Musicxml Export] - Unable to export score in concert pitches

I'm now transcribing a score in braille, and the score uses lots of transposed instruments written in sounding pitches (as the instrumentation page writes), so the score turns on Concert Pitch checkbox. However, the exported Musicxml seems not to keep this, all are in transposed pitches. Sibelius can export scores in both concert and transposed pitches. I have done almost 70% of this very complicated orchestral score, and just discovered this problem, which almost denies all my work during these 4 days. Now the solution is I have to write a note saying this score was in transposed pitches, not the original appearance, and then wait for the fix, then re-transcribe these staves in correct pitches (3 cls, 4 hns, 3 tpts, 10 staves).

Haipeng