Operating temperature range.

My G1 shuts down if I submerge in water around 6°C after a couple of seconds. I was trying some cold plunges also downloaded the app. But every time I submerge the watch turns off completely.
Despite operating range is listed from 0°C to 40°C.
I can turn on the watch after it but it just doesn't work in low temperature environment.
Is my watch faulty or others have same behaviour?