Clef on transposed part vs. clef in concert-pitch score
I am doing an orchestra score in MS3.3.4 with all parts shown at concert pitch. For the F horn staff in the score, I use alto clef consistently. On the part, the default is treble clef, which roughly fits with the transposition up a fifth. In MS 2.3.2 when I created a horn part from a concert-pitch score, it came up transposed and in treble clef, while in the score it still appeared at concert pitch and alto clef - as I would expect.
In 3.3.4 when I create the part, it initially comes up transposed but in alto clef - same clef as in the score. But when I change the part to treble clef, the score also changes to treble clef.
My workaround is to use a separate "scratch" copy of the score file for generating parts, so any such unintended changes don't affect the file that I use for the score proper. But if 2.3.2 got it right, why can't 3.3.x?