Re-pitching single notes to chords with MIDI keyboard doesn't work for notes that are tied.
1) Enter rhythm in rhythm mod, using some tied notes.
2) Repitch in Re-pitch mode, using chords
When playing a chord on an untied single note, it works fine, replacing the note with the chord. When doing this on a note that is tied to the next one, the chord rightly replaces the second note, but not the first one, which is only replaced with the note of the chord (most often, but not always the highest one) tied to the highest note of the second occurrence.
As the chord correctly appears to replace the second note, this can't be a feature. So it might be a bug.
The workaround consists in hitting the left arrow twice (computer keyboard), entering the chord again (MIDI keyboard), which advance the selection to the second chord, hit + (computer keyboard), which create the ties to the previous chord.
Also, note that repitching chords works fine when there are no ties, but repitching the first of two tied chords changes the first and removes the ties, letting the second unchanged, instead of repitching the two as it does for single notes. But here the workaround is much simpler. Just hit the + key and the second chord is replaced by the same chord as the first one and correctly tied. The user must be warned that it only works immediately after repitching the first chord. This obviously corresponds to the fact that hitting the right arrow will not move the selection but will change the action of the + key from tie to the previous note/chord to tie to the next one.
Although this is workable, it is pretty much inconsistent and should be normalized to works the same for chords as for notes.