Unwanted black lines on image borders

Hi,
I guess I am not the first to ask about it, and may be there is already a topic on it (but I didn’t found it) : how can you avoid this disgracefull black lines on the images borders, like here:

Are you using Big Sur on an M1 Mac? Sparkle relies on image support in the underlying OS, and that OS/CPU combination has that bug. It’s fixed by upgrading to Monterey.

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Yes, Big Sur + M1…
I will upgrade.