I think this is partly due to the usage of the very word "hotdog". In Brazil, cachorro-quente (a literal translation of hotdog to Portuguese) is a sausage in b

I think this is partly due to the usage of the very word "hotdog". In Brazil, cachorro-quente (a literal translation of hotdog to Portuguese) is a sausage in bread - with various other ingredients thrown in depending on many factors, including location (in São Paulo, it's common to add mashed potato; in Rio Grande do Sul, it's common to add "batata-palha" - crunchy potato sticks), etc. Some add sweetcorn. There's usually lettuce, some times other vegetables. That, in my mind, is undeniably a sandwich. In the US, as far as I can tell, the sausage alone can be called a hotdog. In Young Sheldon, they frequently have "hotdog spaghetti", which seems to be pasta with sausage cut in chunks. The sausage alone is not, by any definition, a sandwich. I wonder if it's at least partially due to this usage that ChatGPT has a tendency to not assume "sandwich" from "hotdog".