It’d be great if you could look at the case below:
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Notice on the page https://webpagetest.org/result/220121_AiDc69_9db666cd2b156390bfbc1d55e94cd5a0/, LCP reported in the summary is 0.881s,
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Now visit https://webpagetest.org/vitals.php?test=220121_AiDc69_9db666cd2b156390bfbc1d55e94cd5a0&run=5&cached=0#lcp which shows that the LCP is 1.4s,
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More over visit https://webpagetest.org/vitals.php?test=220121_AiDc69_9db666cd2b156390bfbc1d55e94cd5a0&run=5&cached=0#lcp-full which makes me sure that 0.881s is the right LCP.
But the question is why’s there a mismatch between what’s reported in the summary vs what’s seen in filmstrip.