Mine do fine. I generally feed them smaller than the space, but they don't really have issues eating the bigger stuff. I keep an eye on them to be safe though. My 1" dubia are much wider than that though, so I don't feed them dubia that size. If they catch a bug sideways, they just chew it until they can flip it around the right way. Chameleons in the wild don't only eat tiny little "size appropriate" bugs. They can often handle bigger bugs, but this way is safer since they are our pets.
Edit: I can also feed fully adult female dubia to adult panthers even though they look really big. I rarely do, but I just keep an eye on them while they eat. Never had an issue with hard insects not going down as long as the size isn't ridiculous (and I am sure that it never is.) I have however had chameleons that had trouble eating large hornworms.