The answer was, even though I had both TLSv1.2 and TLSv1.3 enabled in nginx, TLSv1.2 wasn't available due to my cipher list as verified by this checker. It appears facebook and linkedin both use TLSv1.2 to generate previews (as of Nov 2022).
musicians theme v1.2 for wordpress 3.x amp; facebook app
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