Several of the comments including the OP appear to be the slight bump when coming to a stop. This is why i clarified that a slight bump 2-1 when coming to a stop is completely normal for this trans. You can also experience a harsh shift or jolt when accelerating from a slight roll if you catch the truck between 2-1 downshift.
Your issue (accelerating after being stopped for a few seconds or after coming off the brakes) is entirely different than the 2-1 downshift bump many have referred to in the thread.
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I am experiencing the jolt from a slight roll. The engine revs to 2000RPM or slightly higher for one or two seconds, truck inches along until it downshifts, then takes off, sometimes spinning the tires. I've had it in twice and they did the update twice with no change. It also seemed to slip when trying step it down to enter an on ramp. Tach climbed and engine seemed to over rev the transmission, almost like revving the engine in park or neutral, then it acted normal again other than the jolt thing.