When I take off quickly on a steep hill in Manual shifting mode, the shift from 1st to 2nd hits with a loud bang and jolts the car sharply. I shat myself thinking I'd hit something!
In a normal (old school) manual, I might expect a bit of clutch drag/slip but this is quite unexpected.

It has to be a steep hill, near full throttle, shifting around 5-6K RPM and I'm using the normal driving profile.
I don't get this issue on the flat or low gradient.

I've tried turning Traction Control off thinking it is trying to compensate for wheel spin, but that does not make a difference. Could it be the 4WD clutch kicking in and pushing power to the rear?

Has anyone else noticed this? Is this to be expected? Will the dealer just tell me not to drive it that way?

162TSI Highline (non R-Line).

I hope someone can advise - thanks in advance!