Why does core web vitals not correlate with Google PSI?

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Testing a domain in Google PSI shows 98% on mobile/desktop for all URLs. But in Google WMT - It shows 7% are GOOD and the rest "NEED IMPROVEMENT". Is there any accurate testing tool for this so we can find the problems and get 100% GOOD URLS ?

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kh_ On

The score at the top of Google PSI is the Lighthouse score. The Lighthouse score does not indicate whether a page passes Core Web Vitals. To see whether a page passes Core Web Vitals, look at the "Field Data" section of the PSI report.