I made a little extension for me (using chatgpt) that filles in the area in inpainting, when a full circle our outline is drawn.
You can adjust your inpaint mask in the settings. Search for mask and change the brush color if you want and the Inpaint mask alpha, if you want to have it transparent.
The Extension grabs your seetings and should always have the same color as you pick.
Just put the unziped folder into the Folder: yourforgefolder\extensions