DSG – Approaching the mountain

Hello together, independent of the car brand I have the following technical question, in which I would like to hear opinions: car: petrol, DSG, electric parking brake with mountain assistance Situation: car drive forward on the mountain car in cold condition: – the parking brake is active. – One pushes on the accelerator pedal. – brake dissolves – car rolls back (~30cm) – clutch grips – car drives “backwise” forward car in warm condition – car does not roll back – car drives “softly” forward, you can do the driving Meinug after, a car, as described in cold condition, may not roll back when driving. I even feel this behavior as dangerous. Friendly greetings Spooci