It just can’t empty the carb, no way no how.
It can only evaporate or leak.
It can however drain back what is in the fuel line.
If you have one that does both it compounds the problem.
My car has an electric pump so neither evap or drain back is a problem, but we have a 72 dart 318/two barrel that does both evap and drain back because it’s hardly ever driven.
That one is pretty much all stock, so it will stay the way it is for now.
A short shot of fuel in the carb and it fires right up.