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I was able to downvote an answer, and then unable to change it immediately after.
Isn’t the “vote too old to be changed” a little too eager?

I read an answer and started to downvote. I took it back 10 seconds later. 5 minutes later I decided it really did deserve a downvote, but then I was unable to do so. I get the message "Vote too old to be changed, unless the answer is changed".

Why am I unable to downvote?

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