2022 Infiniti QX60

I was moving down a small slope behind other vehicles at a speed of 40-50 mph. In order to slow down a bit, I decided to manually downshift gear, I pressed the left switch and expected that after changing gear the speed it would begin to decline. But instead of slowing down, I felt a push in my back and for a second the car began to accelerate and only then began to slow down. I had to urgently apply the brakes so as not to crash into the car in front. I tried again to shift down and each time before changing the gear the car accelerated, although I did not press the accelerator pedal. To test why this is happening, I connected an OBD 2 device to record time, speed, absolute throttle position, accelerator pedal position and engine RPM. I have reproduced the situation on the track and it appears that the car's software actually increases throttle during manual downshifts. This is very dangerous and can lead to an accident, because the driver expects a decrease in speed, and instead of this, the car accelerates itself. I tried to contact the manufacturer, but they didn't even listen and sent it to the dealer. The dealer said that there was no new software and did not even check the dangerous behavior of the machine.