Unexpected behaviour when mixing depends_on and branches

I'm trying to construct a CI/CD pipeline that should build for all Git branches, publish an artifact only for the `main` branch, and deploy if an artifact was published, e.g.

```yml
- command: ./gradlew build
key: build

- command: ./gradlew jib
key: publish
branches: "main"

- command: deploy.sh
key: deploy
depends_on: publish
```
What I've found is that the `deploy` step executes even though the `publish` step does not. Worse, if the `publish` step isn't even defined, the `deploy` step still runs, e.g.
```yml
- command: ./gradlew build
key: build

# - command: ./gradlew jib
# key: publish
# branches: "main"

- command: deploy.sh
key: deploy
depends_on: publish
```
I haven't tried the `if` property so I don't know if it works the same way as `branches, but I wouldn't expect this to be the behaviour for `depends_on`. I would expect the step to fail, or at worse, wait indefinitely.