Creating backfill for a dag is affecting other dags too

[atul-astronomer]

Apache Airflow version

main (development)

If "Other Airflow 2 version" selected, which one?

No response

What happened?

When user is creating a backfill for any specific dag existing dagruns, backfill for other dags are getting created if dagruns are present for same duration.

Backfill is created for duration 5th May to 7th May

Similar backfill is created for other dags too

What you think should happen instead?

No response

How to reproduce

1. Have some dags where a few past dagruns are present.
2. Create backfill for any dag for existing dagruns.
3. Notice backfill is created for other dags too where dagruns were present for the same backfill duration.

Example DAG:

from datetime import datetime

from airflow.providers.standard.operators.bash import BashOperator
from airflow.sdk import DAG

dag = DAG(
    'test_api_dag',
    start_date=datetime(2025, 5, 1, 3, 28, 0),
    schedule='@daily',
    is_paused_upon_creation=False,
    catchup=True
)

hello_task = BashOperator(
    task_id='test_task',
    bash_command='echo "Hello World from Airflow!"',
    do_xcom_push = True,
    dag=dag,
)

hello_task

Operating System

Linux

Versions of Apache Airflow Providers

No response

Deployment

Other

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

• I agree to follow this project's Code of Conduct

[vatsrahul1001]

Taking a look at it

[vatsrahul1001]

This is only happening for when we create a backfill for a date for which DAGRUN already exists after selecting ALL_RUNS radio button