I’m not sure how the wood color changed so fast.. did it happen over time? You may need to have lacquer repainted on it several times to get the color even and back to normal. Maybe air dry first to see if it evens out and use lacquer again.
Why would you hang a,wet item in a closet in the first place? And once you did, why would you care what the closet floor looks like? It's just a closet.
