This might just be me, but I expected this issue to be taken far less seriously than it has been in the given communication [0]. In the linked similar issue [1], they even talk about revoking the certificates, which seems insane to me for being one second off. Is there any actual serious problem with this extra second I'm missing?
[0] https://bugzilla.mozilla.org/show_bug.cgi?id=1715455
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1708965