I have a problem when trying to clone a png image with no background in the texture paint section. I select the image in the clone tool but when I start cloning it, the transparent background turns white, painting my texture white. Any idea how I can fix this?

I have a problem when trying to clone a png image with no background in the texture paint section. I select the image in the clone tool but when I start cloning it, the transparent background turns white, painting my texture white. Any idea how I can fix this?

Edit: Here is the PNG image I want to clone, with a transparent background:

But when I try to clone it into my texture, the transparent parts turn to white.