yarn install exits 0 without touching node_modules whenever node_modules/.yarn-integrity matches yarn.lock, so a package deleted from node_modules stayed deleted while bootstrap printed "bootstrap complete". After the install, bootstrap now asks node for the package.json of every package listed in dependencies and devDependencies of package.json, and on the first it cannot find it names the package and the fix: rm -rf node_modules && make bootstrap. A package whose exports hides its package.json (ethers, libsodium-wrappers-sumo) makes node throw ERR_PACKAGE_PATH_NOT_EXPORTED, which it does only after finding the package, so that error counts as found. Model: opus-5-5