Instrument Change also changes instruments on other staves
To reproduce this bug:
1. Create a score with 2 or more different instruments (In my case, oboe and Bb clarinet)
2. Implement an instrument change on both staves in the same measure, do not use m. 1 (Measure 7, oboe to English horn, Bb clarinet to Eb clarinet)
3. Change the Long or Short instrument name of the FIRST staff AFTER the instrument change
Using my example, the second staff that's meant to be Eb clarinet at that measure is somehow now English horn along with the first staff after I changed the oboe.