Edit ignores the prompts and returns the original image or botched up original image -- API

API
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1

I am trying to do a in painting. AS per the api doc: https://platform.openai.com/docs/api-reference/images/createEdit provided snippet as below

 if current_mask_path and os.path.exists(current_mask_path):
            response = client.images.edit(
                image=open(last_image_path, "rb"),
                mask=open(current_mask_path, "rb"),
                prompt=prompt,
                size="1024x1024",
                n=1,
            )
        else:
            response = client.images.generate(
                model="dall-e-3",
                prompt=prompt,
                size="1024x1024",
                n=1,
            )

mask is the same size image stored as RGBA 32 bit png. not sure what is missed here.
Prompts are ignored in the edit and alpha mask is filled as in original image.

Any clue around this will be of great help!