I think the issue I described above is related to colorspace conversion (RGB->YCbCr), and it may well be that this is a normal amount of color shift due to lack of 100% color overlap between colorspaces. And the roundtrip magnification is why you should always try to reduce your colorspace conversions.
TL;DR: this may not be a bug at all, but just the normal weirdness that comes with colorspace conversion.
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