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Ah Hah! Mystery solved. Turns out this was the Ludicrous+ Easter egg. Very cool. Tesla Ludicrous+ Easter egg makes its way to P100D vehicles, 0-60 in 2.4 seconds
Actually, this just happened to me as well. Previous update for supercharger amenities/driver profile had installed and was working fine a week ago. Got new notice of update this morning but after completing it was exactly the same update as before.