Except they decided to "smear" leap seconds [0], instead of handling them appropriately.
For that reason, if you "require correct timestamps for legal purposes" [1], you may want to make sure that you aren't using Google's NTP servers.
(N.B.: Amazon (AWS) too, FWIW.)
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[0]: https://developers.google.com/time/smear
[1]: https://docs.ntpsec.org/latest/leapsmear.html