'17 Scat Pack trans shuuder

Only the 2-1 downshift and only when in automatic mode.

Anyone else have it or hear of it?

Dealer tomorrow (3067 miles), hoping a quick reflash does it.

Or am I being too optimistic?

Take it in and have them do a trans re-learn procedure on the 8speed.
It should clear up the harsh downshift .I've had several off the truck do this and the re-learn always smooths it out.The adaptive memory can get out of wack in these things and Quick learn resets things.Some times a throttle relearn ,ETC, helps to.