Won't Run in Reaper if Playback Rate != 1.0

I noticed a behavior that had me stumped for some time: Spectro will not work in Reaper when the Playback Rate isn’t 1.0.

Is this intended? It had me completely baffled for the longest time, because Spectro would appear to work in all projects except for one I had accidentally set the Playback Rate on. :astonished: