Yeah- there is just a delay ~before~ switching presets.
If you try it the same way from a tremolo to a distortion you can hear it clearly.
It’s too bad.. spillover would be cool.
I will often structure my part-changes to use BYPASS tails… so I will btpass the H9 and go dry (well.. not dry haha ) for a measure or two before I bring in the next patch on the H9. It’s not optimal.. but it works.