Original discussion here: #yarn-charting message
Some RBN songs have an instrument charted as vocals and use the note names as lyrics. For sharps, the lyrics contain a trailing whitespace so it shouldn't be parsed as an unpitched note. YARG trims the whitespace which causes these notes to be displayed as unpitched.
Example songs:
https://www.youtube.com/watch?v=9mjqNMcMtpE
https://www.youtube.com/watch?v=WIMO3ewh_tU