FCP is shorter than reported Server Response Time

[I Biron Ren]

Hello, 

I was testing pagespeed on the site in the screenshot below and encountered something I'd never seen before - the FCP time was shorter than the Server Response Time reported in PSI. I'm looking for some clarification on how this happens/how exactly FCP is calculated. 

My understanding is that FCP includes the TTFB, and LCP includes FCP as well as TTFB. So, each metric measuring starting at the time the initial request is sent out by the browser. Is this not the case? 

I 

[Rick Viscomi]

I agree something doesn't look right. Could you file an issue in the Lighthouse GitHub repo?

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[I Biron Ren]

Not sure if I filled the issue report out properly but I've submitted it there. Thanks!