What happens if you have a best answer that gets replaced or deselected?

Question

Of course it isn’t the best answer but like what happens point wise

Answer 1

If your answer is deselected, you lose the +20 points you get from having the answer selected.

The author of the question also loses the +2 points they gained from having BA selected on their question, unless a different answer to the same question was selected in place of the old one.