cross staff beam has wrong stem direction in imported v1.3 score

This is related to #14784: Issues with cross-staff beams & slurs in imported 1.3 score

Open attached score in V2 beta2. It looks like this:

while it looks correctly in v1.3:

Analysis:

In the mscx the section for the first beam of the treble staff looks like this:

<Beam id="0">
</Beam>


while the third beam looks like:

<Beam id="2">
<StemDirection>up</StemDirection>
</Beam>


For the first beam there is no explicit value for SteamDirection. It seems to me, that in v1.3 the default value for StemDirection is calculated as if the notes where shown on their original staff. V2 however seems to base the default on the staff the notes are actually shown.

The slur misplacement might be due to a similar 'reference staff' problem.

Using d2a07a1 on Kubuntu 12.04