Tuplet noted in ABC convert to MusicXML

[tsugumi]

music21 version

9.1.0

Problem summary

Converting a score written in ABC notation to MusicXML may result in incorrect MusicXML output.

Steps to reproduce

ABC notation source

X:1
L:1/8
M:6/8
 (10:6:5c3/2c3/2c3c3c |]

Music21 code fragment

score = converter.parse(abc_string, format='abc')       
score.write('musicxml', output_file)   

Expected vs. actual behavior

Expected

Actual

More information

The abc2xml https://wim.vree.org/svgParse/abc2xml.html can correctly convert the above scores.