Parking uphill issues

I've tried to park all the cars on the attached image slope and here below the strange behavior:

Gavril Grand marshal: the parking brake do not keep the car stop on a slope. Quite strange for a automatic gearbox, P should keep the car hold quite strongly. If I'll push the brake pedal it helps but it won't stop the car at all.


Ibishu Covet: the parking brake do not stop the car uphill/downhill but it's realistic. Some older car can't keep the car stopped only with the handbrake pulled, they must have the gear inserted and the engine stopped to assure them correctly. The thing is that if I pull the handbrake and push the brake pedal also, the car keep slowly go down the hill. That's too much... even for the cheapest Covet


Gavril D-Series: as for the Grand Marshal


Civetta Bolide: the only car that stay stopped when I pull the handbrake, even it's manual gearbox. But if I'll push the brake pedal, the car start to move a little bit.


Gavril H-Series: as for the Grand Marshal

EDIT
My bad... I had a misread on the already known bugs... please delete the thread.