[Musicxml Export] - Hairpins disappear when meeting irregular bars

Hello,
The attached is from Ravel's Rhapsodie Espagnole. Since I can't operate page deletion, the extraction is near the end of the music, around bars 45-55, so please go there. The problem is, when meeting an irregular bar like the clarinets cadenza, Musescore exports Musicxml with lots of hairpins missing right from the cadenza part to the end of all coming parts. In this piece, all hairpins disappear from part 5 on. Therefore, I'm quite afraid that I can't do any braille transcriptions when meeting such kind of scores, no matter how well they were engraved. What's wrong with the export? Thank you!

Haipeng