As MODO Bass considered the last slide in this part to be unresolved (i.e. My reasoning for this is that my slides in the previous part were down slides.
After doing this, the part played correctly. The solution was to edit the MIDI part after the part that had the slides and explicitly add pitch wheel controller data with a value of 0 at the start of the part.
I had a MIDI part in the track that had some slides in it (created using pitch wheel controller data), and the part immediately after that part was then having the open string note issue. The issue turned out to be errant slide data (pitch bend) that was impacting subsequent MIDI parts. In other words, if MODO Bass would normally play the notes on the "A" string, then is would play all of the notes as open A rather than the actual fretted note. I don't know if you've resolved this issue yet, but I just had success in resolving a similar issue where at certain points in my MIDI parts, MODO Bass would play all notes in the part as an open string note.