Provide the steps to reproduce

1. Run LH via webpagetest.org on https://sanity-www-fenaw9fjm.now.sh/

What is the current behavior?

The score report and score calculator do not match.
Here are the results:
WPT Desktop Test: https://www.webpagetest.org/result/200523_SN_5c9583ca40eccaa61ef6bbc7392cc3fb/
LH Desktop Report: https://www.webpagetest.org/lighthouse.php?test=200523_SN_5c9583ca40eccaa61ef6bbc7392cc3fb&run=2

Calculator: https://googlechrome.github.io/lighthouse/scorecalc/#first-contentful-paint=1114.902&speed-index=1839&largest-contentful-paint=1898.038&interactive=1851.684&total-blocking-time=17.261999999999944&cumulative-layout-shift=0.007962289589066526&first-cpu-idle=1851.684&first-meaningful-paint=1114.902&device=none&version=6.0.0

What is the expected behavior?

I should have a score displayed of 99 (according to score calculator)

Environment Information

• Affected Channels: WebPageTest (idk what they are using)
• Lighthouse version: 6.0.0
• Operating System: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36

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