[MusicXML export] Grace after note

1. Open attached mscz (produced in 2.0 beta 2).
2. 'File'>'Export…'.
3. Choose 'MusicXML'.
4. 'Save'.
5. Open MusicXML.

Expected result: All grace notes are after.
Actual result: The first two grace notes are before, whilst the third (last in the bar and treated as such, possibly) is after.

Notes:

Also attached is the produced MusicXML.

Import seems fine, having tested with this file.

Using MuseScore 2.0 Nightly Build 426d8fd - Mac 10.7.5.