Redirection test fails

The redirection to existing webp test fails, but in the part where it lists the response headers, one of them is – x-webp-convert-log: Serving original (it is smaller).

That seems correct, because it says it is expecting 6964 bytes, but the response’s content length is 3195.

I ran this test because it seems that the plugin is re-converting to webp for every request, impacting site performance. But these results don’t seem to explain why.