Previously, historically locked questions (and the answers) had their voting buttons hidden. The faq says:
In addition to the post notice being prominently displayed, posts which are historically locked are "frozen in time": they cannot be voted on, flagged, answered, edited or commented (though they can be favorited, and ♦ moderators can edit and comment; moderator edits to historically locked posts do not bump the posts). The visual appearance of the entire post is altered by removing the voting arrows from the question and all answers.
Now, somehow the voting buttons are shown on historically locked posts:
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