5 sharps in concert pitch converted to 7 flats when toggle from written pitch to concert pitch for E-flat instruments

5 sharps in concert pitch converted to 7 flats when toggle from written pitch to concert pitch.

step to reproduce:
1) add any E-flat instrument (e.g. alto sax, baritone sax) to score
2) toggle to concert pitch
3) set key to 5 sharps
4) toggle to written pitch
5) toggle to concert pitch again
6) E-flat instrument's key is displayed as 7 flats (other instruments are 5 sharps)

6 and 7 sharps in concert pitch also cause same problem.