Parameter changes are not saved upon session re-load

Repro steps from John:
1. Create new Ableton live 10 project and load synth into a midi track
2. Edit various parameters such as osc shape, ADSR and filter parameters
3. Record simple MIDI clip on that track
4. Save and quit Live
5. Open live set from 4. Params are all at default value

confirmed using Reaper on macOS