Problem with Send Tracks (FX are sometimes muted)

Sometimes after loading a saved song into Renoise, sometimes one of the fx devices in a send track doesn’t work properly. E.g. if a reverb vst is placed into a send track, and an instrument is routed to it, the reverb sometimes doesn’t work, like it’s bypassed. But auto suspend on this vst is disabled. Then, if i click the bypass button of the reverb’s device container to disable it and then enable it again, then it works again how it should.