Unknown Content-Type for image/avif

Hello,

we’re using the Cache with Vary for images. It seems that the image/avif content-type appears Unkwown and we get many Bypass.

When using Edge (webp), on the first request we get an expected Miss with the Content-type header.
On the next request the expected Hit with Content-Type.

When using Chrome (avif), first request Miss and Content-Type header.
But next request there is no Content-Type.

The origin server always send the correct Content-Type header depending on the Accept header.

Are “Unknown” image/avif ? Are the missing Content-Type header and the high number of Bypass related ?

Thanks

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