Strange bug in MusicXML import from Finale

I noticed a peculiar bug when MuseScore nightly (tried two versions over the past week) imports a musicXML file created by Finale. The import gets clefs and notes wrong on some voices. Yet if I simply save this result (as .mscz), close it, and re-open it, it is correct. See attached files. It also is correct on initial import to MuseScore 1.3 (no save and re-open required).

test.mus_.zip is zip of test.mus, the starting Finale (2012) file.
test.mus.pdf is a pdf from the original Finale file (a snippet of a longer piece).
test.mscz.pdf is what i get on initial import to MuseScore Nightly.
test2.pdf is what I get after closing and re-opening.
test.xml is the musicXML file produced by Finale.
test.mscz is what I get immediately saving the opened test.xml file.

In particular these results were obtained with MuseScoreNightly-2014-05-27-1722-2b832e8, on a Mac running Mavericks 10.9.3.