Lower case minor chords bug

How to reproduce the bug:
1. Create a new document and write some notes.
2. Enter both type of chords - major (C, G) and minor (Em, Gm).
3. Save the file and close MuseScore.
4. Open the file once again.
5. Go to General Style options > Chord Symbols and then check: Lower case minor chords.

Effect: All chord letters are now lower case (including major chords).

Problem occurs in v2 Beta 1