In the example file pianodata\match\beethoven_op002_no2_mv1.match there are some trill markings. They do not show up in the alignment and in fact are probably not parsed correctly in line 199 of importmatch.py. A reason for the bug could be the regex for the line as defined in line 867 of matchlines_v0.py:

ornament_pattern: re.Pattern = re.compile(r"trill\((?P<Anchor>[^\)]*)\)-")

I think this is missing some regex for the performed note after the dash.