Yes, Chrome and Safari will not load a site if the cert is not in CT. https://no-sct.badssl.com/
They don't actually go check and compare the embedded SCT with what is in the logs. It would be incredibly slow to load the site if they did that.
(in memory of Douglas Adams)
It's this one. https://bugzilla.mozilla.org/show_bug.cgi?id=505521
RunSet™: Install everything everywhere all at once.
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