Swing discrepancy between mscz and générated mxl

I observed a discrepancy between .mscz and generated .mxl when using swing (66%) and triplets with sixteens.
Try the attached file in musescore with a low tempo and export it in .mid and .mxl formats.

.mscz is right
generated .mxl is wrong (swing is ignored)
generated .mid is right