When we find something wrong with what we publish and can't fix it right away, we record it and have someone other than the finder confirm it's real. Once we're sure, it's published here — we don't wait for the fix, and we don't wait to explain it.
Every defect is also written about in Methods, our journal about how the work gets done, and links to its issue once that's published. When one is corrected, it's marked here.