Assuming the shopping cart didn’t create itself, it came from somewhere. I’m guessing it didn’t roll itself into the grass from inside the store. It was deliberately placed there. It will also stay there until someone consciously observes that it’s in the incorrect place and decides to physically move the cart.
But to the person visiting the store for the first time, for all they know the shopping cart has been there the whole time. Maybe someone put it there for a reason. Maybe they’re coming back to it. Maybe the shopping cart is serving a purpose.
I’ve seen hundreds of shopping carts not in the correct place, whether they show up in a parking spot or in the grass under a tree. The shopping cart is an obvious example of something being out of place, but I’ve seen this repeated in a dozen other ways. People do things because that’s the way they’ve seen them done before or how it’s always been done. Unless you’re conciously focusing on the present, the mind goes into auto-pilot. That will get you through most day to day tasks, but the vast majority of observations and insights happen when your mind is single focused on what’s in front of you.
Otherwise your world becomes full of abandoned shopping carts.