Is Polish now converting WebP hosted images back to JPG for unsupported clients

Website, Application, Performance
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According to this article: https://support.cloudflare.com/hc/en-us/articles/360000607372-Using-Cloudflare-Polish-to-compress-images

Polish can only go from PNG/JPG to WebP, not the other way around:

To ensure WebP is not served from cache to a browser lacking WebP support, disable WebP at your origin web server when using Polish.

However, when host a WebP image, turn on Polish, and view that image using Internet Explorer 11, CF transparently vends a JPG to the browser.

This is great! But, it seems to conflict with the documentation. Any clarification here?

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Hoping someone from CF can confirm that this is indeed happening.

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