Firefly is broken

Using firefly to remove objects is downright broken for darker images. First of all, the image it generates doesn't match the source in terms of brightness. It's too dark. Second, it leaves a faint trace of what was there before. What do I mean by that? Imagine you have a dark image with some neon lights. You make a selection to remove them. What you're left with is a spot that doesn't blend with the rest of image and if you look closely, you can STILL see the neon lights.

Check out this image below. There used to be two neon lights. I made a rectangle to remove them. Now you can clearly see that the brightness is off and there are two lines where the neon lights used to be.

In addition, if the image has any noise at all, Firely can't generate the same noise pattern.

I'm using the newest version of photoshop 26.9.