Without this, "drop-in" configuration files like "foo.service.d/10-override.conf" were erroneously considered units as well, which lead to runtime panics:
thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', /root/.cargo/registry/src/github.com-1ecc6299db9ec823/cargo-deb-1.38.2/src/dh_installsystemd.rs:282:84
Without this, "drop-in" configuration files like "foo.service.d/10-override.conf" were erroneously considered units as well, which lead to runtime panics: