Strange Trouble with Generative Erase Tool

I'm trying to get into using AI Generative Erase tools, but odd (I think) behavior I've experienced was with an image in which I was trying to remove a car from the foreground. The good news is that in a way it did so, but the bad news is that it just replaced it with a different car! As if my problem wasn't the presence of the car itself but what kind of car it is! Obviously that's not the case -- what I was hoping for was a normal-looking street where the car was located. Is this is a known bug, or am I doing something wrong here? Thank you.