Please tell developers that we do not use comma in English before AND. ChatGPT always put comma before it. It is a bug.
What you are describing is known as the Serial of “Oxford” Comma.
“We” absolutely do use it in English. It is grammatically correct to do so, it avoids ambiguity, it is considered mandatory in most formal writing, and not using it can cost you millions of dollars.
In short, you are wrong—it is not a bug.