TJaniF opened a new issue, #48408:
URL: https://github.com/apache/airflow/issues/48408
### Apache Airflow version
3.0.0
### If "Other Airflow 2 version" selected, which one?
Current main and last nightly
### What happened?
Using these two DAGs correctly fetches "Hello" in Airflow 2.10 but "None" in
3.0.0
```
from airflow.sdk import dag
from airflow.decorators import task
@dag
def cross_dag_xcom_upstream():
@task
def push_to_xcom():
return "Hello!"
push_to_xcom()
cross_dag_xcom_upstream()
@dag
def cross_dag_xcom_downstream():
@task
def pull_from_xcom(**context):
my_data = context["task_instance"].xcom_pull(
dag_id="cross_dag_xcom_upstream",
task_ids="push_to_xcom",
key="return_value",
include_prior_dates=True,
)
return my_data
pull_from_xcom()
cross_dag_xcom_downstream()
```
### What you think should happen instead?
The pull_from_xcom() task should return "Hello"
### How to reproduce
1. Add the tasks above
2. Run the upstream task
3. Run the downstream task
4. See "None" in the task logs.
Same dags (with adjusted import for the dag decorator) in Airflow 2.10:
### Operating System
MacOS 15.3.2 (24D81)
### Versions of Apache Airflow Providers
None
### Deployment
Other
### Deployment details
Astro CLI for the nightly, breeze for main.
### 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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