Usually the full instrument names are only used at the start of the score, and abbreviations on all subsequent lines.
If a line object is added the full Instrument names will be used on that line.
After closing and reopening the score the problem dissapears.
Abbreviations.mscz
Comments
Connected with #272134: Instruments short name jumps. Relates to #272132: [EPIC] Text positioning issues
fixed with #272134
Automatically closed -- issue fixed for 2 weeks with no activity.