Does the Polish Lossy work?

I tried changing the Polish in page rule to lossy from lossless and cleared cf cache.

After requesting the the PNG file I got same file (MD5 hash matched when I compared both) but cf-bgj response header changed from: “imgq:100,h2pri” to “imgq:85,h2pri”.

Could it be something like Cloudflare doesn’t consider the quality downgrade worth it and returns the 100% quality WebP image but still sets that imgq:85 to the cf-bgj header or something?

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