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There is no issue here. The car is holding the revs since you just went WOT... it's trying to remain in a sporty mode.
I imagine that the car will upshift if you let off the gas completely then give it slight throttle to cruise at a constant speed. It might take a few seconds, but the car will recognize that you are just cruising so it will shift into a more efficient gear.
I'd be more concerned about this issue if the car was not shifting gears even after you told it to. Doesn't sound like any issue here so I wouldn't worry.
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