There appears to be a bug when you add pitch wheel automation to Massive X in Reaper. The note will sometimes stay on if you stop playback during the note. Once the note is on, the only way to turn it off is to keep playing the same note until it stops. Even triggering another note will not stop it. It has to be the same note. This doesn't happen with the original Massive or FM8. I have attached a Reaper project MRE (minimal reproducible example).
