X_SPAWN_TIMEOUT_PIN_UNEXPLAINED
Means
a package's untimed-spawn pin has a blank reason
Typical cause
a count with no sentence names nobody who ends the child; the count is not honoured, so the sites are reported behind it
Fix
write who ends each child in scripts/lib/spawn-timeout-pins.ts, or add a timeout to each and run bun run scripts/spawn-timeout.ts --unpin <package>