Freeze bug - midi controllers out of synch with notes

I’m trying to freeze an instrument track so I can pass the project on to a fellow musician that doesn’t own that track’s VSTi. The problem is when I freeze the track the midi controller events are out of time with the note messages. In particular I’m trying to freeze a Hammond track which uses the mod wheel to control the leslie speed. Everything plays back fine before the freeze, but after the freeze while all the notes are fine, the leslie speed changes are way off (e.g. seconds) from where they used to be. I also tried rendering the track in place, which has the same problem with the leslie speed changes still at wrong, but different places. I suspect the problem is whatever software is taking care of the midi controller is not properly chasing all the tempo changes in the file (of which there are a fair number), but that’s only a guess. Help…

Sorry, I forgot. I’m running Cubase Pro 10.5.12 under the latest version of Windows 10 as of 5/14/20.