esoyer opened a new issue, #26630:
URL: https://github.com/apache/airflow/issues/26630
### Apache Airflow version
2.4.0
### What happened
After having upgrade our Airflow from 2.3.4 to 2.4.0, we observed that the
DummyOperator was deleted (by the way, the release note does not talk about
this at all).
We ran our tests which check that the import_errors from our dag bag is an
empty map, and the tests were passing even though the imports of DummyOperator
were still there in the DAG python files.
The test looks like something like this:
```
dagbag = DagBag(include_examples=False)
assert dagbag.import_errors == {}
```
### What you think should happen instead
We were expecting the test to fail since we are importing an Operator which
does not exist anymore.
### How to reproduce
Upgrade to Airflow 2.4.0 and import the `DummyOperator` in one of your DAG
python file. Run a test which checks that the `import_errors` from your Dag Bag
containing your DAG with the wrong import is empty. It should pass even though
the import is invalid.
### Operating System
MacOS Monterey Version 12.5
### Versions of Apache Airflow Providers
_No response_
### Deployment
Virtualenv installation
### Deployment details
_No response_
### Anything else
_No response_
### 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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