Songbook displays pitch incorrectly

I am experiencing inconsistent behavior with score display in Songbook when parts have transposing instruments assigned. I presume that if a score is saved with Concert Pitch on, all parts should display in the same key. However, I find Songbook usually displays the score as if Concert Pitch is off, even though the same file displays correctly (i.e., Concert Pitch is on) in the MuseScore editor. Confusingly, sometimes Songbook displays correctly, but I cannot figure out the "magic" behind the behavior.

It would be very helpful if there was a button for turning Concert Pitch on and off in Songbook.