Key signatures go back to the first instrument showed after removing the first measure in a score with parts

2.0.3 version / Windows7

1) New score for Bb Clarinet and Flute
2) Generate parts.
3) You are here:

4) Just for checking : in main score, delete (Ctrl + Del) the second measure
Result in parts: as expected
5) Now, delete (Ctrl + Del) in main score the first measure

6) Go in Flute part :
Result : the key signature shows two sharps (as the top staff, ie the Clarinet)

- Same result of course with a larger score, eg a quintet:
Quintet test.mscz

1) Delete the first measure in main score

Result : in parts, all the instruments display the key signature of the top staff (ie treble flute)

- Good new : I cannot reproduce from scratch this issue with the current nightly: d8f370f