Required for integration tests to power off on PID 1 crashes. We deprecate systemd.crash_reboot and related options by removing them from the documentation but still parsing them.
Otherwise, PID1 arguments e.g. "--deserialize 16" may be parsed unexpectedly by generators. Fixes the issue reported at https://github.com/systemd/systemd/issues/24452#issuecomment-1475004433.