Lol. That would be me. I invented SoundSwitch.
It looks like Engine is importing the BeatGrid from RB in an unexpected way and the anchor points are set so often that SoundSwitch is having difficulty calculating phrases based on those anchor points.
This issue isn’t likely to be fixed in the near term as this issues is caused by SoundSwitch getting 3rd party data, that’s been converted by Engine OS before being imported to SoundSwitch. That a lot of variables to account for.
One test to try would be to space out the anchor points with a more reasonable distance, say every 8 bars or so.
Difficult with nonquantized production as you have mentioned.
This is a difficult corner case to account for from our end.