[MusicXML Export] invalid MusicXML for prallprall line
See mscz file attached to https://musescore.org/en/node/83516. When exported as MusicXML, measure 100 in part 2 contains a note with both a wavy-line start and stop, with number=0, which is invalid MusicXML.
Comments
The export of wavy line is buggy even with one line. I'm not sure why the code doesn't use endSegment and track2 to find the start and end chords. See the attached example where only a stop element is exported.