Sometimes a test fails and shows a grey image as diff

[sbaropeak]

Sometimes some snapshot tests fail with no visual difference and the diff image is just grey:

No modification has been done to the tests that fail in this way. In order to fix I just record again the references and commit the result.
I wonder if this has something to do with the PixelTest library or if there is something in my project that could trigger that behaviour.

Thank you.

[sbaropeak]

I found why is this happening, it seems that the image generated is slightly different if it's generated on an M1 or on an Intel. It doesn't happen with all the images. There is a good discussion about this problem here
One of the possible solutions could be to add precision to the image comparison.