collinmcnulty opened a new issue, #23343:
URL: https://github.com/apache/airflow/issues/23343
### Apache Airflow version
2.2.5 (latest released)
### What happened
If the argument `owner` is unhashable, such as a list, the DAG will fail to
be imported, but will also not report as an import error. If the DAG is new, it
will simply be missing. If this is an update to the existing DAG, the webserver
will continue to show the old version.
### What you think should happen instead
A DAG import error should be raised.
### How to reproduce
Set the `owner` argument for a task to be a list. See this minimal
reproduction DAG.
```
from datetime import datetime
from airflow.decorators import dag, task
@dag(
schedule_interval="@daily",
start_date=datetime(2021, 1, 1),
catchup=False,
default_args={"owner": ["person"]},
tags=['example'])
def demo_bad_owner():
@task()
def say_hello():
print("hello")
demo_bad_owner()
```
### Operating System
Debian Bullseye
### Versions of Apache Airflow Providers
None needed.
### Deployment
Astronomer
### Deployment details
_No response_
### Anything else
The worker appears to still be able to execute the tasks when updating an
existing DAG. Not sure how that's possible.
Also reproduced on 2.3.0rc2.
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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