Bad artifacts appear when using roop (a1111) on fullHD images

[AlekFy]

roop creates bad artifacts at this resolution AROUND the head of the character (the face is fine, transformed OK). For example on the edge between a man's shirt collar and his skin becomes "aliased".

I'm using img2img with denoise 0,01 (the lowest you can get before zero) without roop https://i.imgur.com/lX5f3Ji.png with roop enabled https://i.imgur.com/qZcoFs5.png All setting the same

Am I doing something wrong? Or is roop good up to certain res? I tried the roop Upscaler option with x2, x3 with no changes, different upscalers - with no change on the aliasing, only the quality of the face changes.

[finley0066]

I have the same issue, and I haven not idea about it! who can help?