Scanning a fingerprint requires much more precision than recognizing a capacity at the inside of a door handle.
It also worked perfectly with other VW cars since years, regardless of weather conditions. So weather shouldn’t be a limitation for keyless access at all.
It worked on my BMW 5 and 3 series as well - as this problem affects both front doors it must be the sensors used for the ID3 - the issue is back now the weather is cold and wet again.