MusicXML file with multiple instruments at the same time in one part does not import correctly into MuseScore
Problem affects: MuseScore 2.1 when importing MusicXML from Sibelius 7.3.1
When importing MusicXML exported from Sibelius, ossias cause MuseScore to add "Instrument change" instructions in almost all the bars which are not the ossia. Hence multiple instruments (hundreds) will be added and are visible in the Mixer.
The attached MusicXML example file will show this problem when imported into MuseScore, caused by ossias in bars 195-197 (Violin 1) and in bars 242-247 (Cello).