The DRC targets called sak-drc.sh with -f "*". Magic flattens any matching cell into its parent, the top cell has no parent, so the pattern emptied it "and Magic reports any layout clean." In the maintainers' words, "its clean results were never real." A tool update now refuses that pattern, which breaks make regression across several repos. Every green DRC from that flow was meaningless, and nobody noticed until the tool itself started refusing.