Uploaded images as "fill" appear without background

Hi! I’m using fullscreen captures certain website pages for a project. When I upload the images in Figma as an image “fill” inside a shape, the background of the webpage is gone - background images and colours. If I upload the same image to the board - not inside a fill - it’s visualised correctly. This happens with different captures and strangely, the issue only appeared recently as I was able to upload the same image I’m testing with right now, inside a fill, without any issues a couple of weeks ago. Do you have any suggestions? Thank you in advance.