[BUG] If there is a hole in the main object of the photo and the background is visible inside it (like a ring), rembg cannot remove the bg of that part

[babakmaziar]

The background around products such as rings or bracelets is easily removed, but the background of the middle cavity of these objects is not removed.

[BenjaminRbt]

Hello,

I do encounter the same issue as you.
I am trying to adjust alpha_matting configuration if it brings any improvement.