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Some chord tones are ignored by harmonizers

When a note is contained in a chord, the harmonizer instruments always prefer other chord tones over shifting the note by thirds, but I found at least one chord where this isn’t the case:

Screenshot_20200831_072457

Since B belongs in E(add9), the 2-note harmonizer should pick E and G♯ (this is what happens on V/vi without the added ninth), but this plays D and G instead.