Kandinsky 2.2 Inpainting Mask Size and Type

Is there a minimum mask size required for the inpainting model? I have noticed that I need to create a very huge mask for an inpainting object to be successfully generated. When using a smaller (or more appropriate) mask size, the model just returns the very same image without any inpainting. I tried using rectangular mask shapes and square shapes but got the same result. I am using a guidance scale of 6. Here is an example of my attempt at inpainting but the output was exactly the same as the input and the prompt had no effect as shown below:

Prompt: “a clock on the wall”

Output image (exactly same as input):

Using extremely large masks does generate inpainted objects but causes the objects in the original image to be morphed. Not sure what I’m doing wrong with the masks, any help will be much appreciated.