Transpose chordnames does not preserve pitch spelling

Steps to reproduce bug
1. Open "chordnames.mscz"
2. Edit > Select All
3. Notes > Transpose
4. Choose key of "D Major"
5. Mark "Transpose chord names"
6. Press "OK"

Expected behavior: Chord names should transpose the same as the notes. Second measure should have a C chordname

Actual behavior: Second measure has a B# chordname

MuseScore version: r. 2896 nightly

(Operating System: Windows 7)