In April 2011, closing a question for some reasons (then off-topic and not a real question) caused the Community user to downvote the question.
Officially, this feature was removed in August 2013. Yet I still observe that closing a question as off-topic, too broad or unclear instantly decreases a question's score by 1, and reopening increases the score by 1. I can't swear that this is systematic but I've definitely seen it happen many times.
Here's a recent example. The timeline shows that the question received two downvotes. But while it was closed as unclear, its score was -3, and since it was reopened its score is back at -2.
I'm tagging this bug because the site behavior contradicts the official documentation. I don't mean this as an opinion either way on whether automatic downvotes should or should not happen: just get the story straight, please.