Some diesels do it some petrols do it - others don't, it depends entirely on the way the engine management computer is programmed to handle low speed running.
A 2002 1.6 Ford Focus I had used to decide to accelerate around left hand slow corners in second gear with foot off gas pedal so badly it was necessary to dip the clutch to get rid of the drive from the motor.
My current Honda 2.2 CDTI diesel doesn't do it.
As to why your Audi has started to exhibit this trait after the first service-sounds like some sort of software update done during the service.
Why not ask the dealer?
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