This is an error reproduction workflow. In this workflow, the birefnet node is used to automatically identify the subject mask for filling. Another branch uses SAM to detect the mask for filling. The mask identified by the birefnet node cannot be successfully filled after inpainting because the mask identified by birefnet is a grayscale mask. Grayscale masks are not strictly black and white, so using the inpaint model in non-zero regions does not fill the content.