yes - this is normal as the ECU has detected a loss of vehicular acceleration (from the SRS unit accelerometer) and the wheel speed info from the ABS unit - it will do such.
This wont be felt when the car is under acceleration load to maintain high speed. But will be felt quite nasty when the car is gently tootling along.
I hope you got find a solution. I personally wont think of it too much and add some CVT compatible friction modifier for the TCC.