Front service personnel question.

When you’re training for this job do they teach you how to bag groceries properly. I remember when I worked ended my training they showed us how to do it properly. But when I see my groceries being back today, I wonder if they just don’t teach them anymore. Not all of them, but a good majority of them. Moreover Why do cashiers always seem to be the worst no matter what supermarket you shop at. Now I get it, since the cashiers the main thing they should concentrate on is their money. But they don’t have to be perfect about it. But I’ve seen them do. The most obvious no nose, like putting soap in the same bag your raw chickens in. So also do cashiers get any sort of bagging training?