Clear task confirmation dialog reopens without clearing the task #75245

Under which category would you file this issue?

Airflow Core

Apache Airflow version

3.4.0b1; also reproduced on main

What happened and how to reproduce it?

Clicking Confirm in the Clear Task Instance dialog causes it to briefly disappear and reopen. The selected task is not cleared or rerun, and its try number remains unchanged.

I reproduced this on main and in a separate deployment using the official apache/airflow:3.4.0b1 image. I observed the behavior in both Safari and Chrome.

Reproduction Dag

from datetime import datetime, timezone
from time import sleep

from airflow.sdk import DAG, task

with DAG(
    dag_id="reproduce_clear_task_dialog",
    schedule=None,
    start_date=datetime(2026, 1, 1, tzinfo=timezone.utc),
    catchup=False,
    tags=["reproduction", "clear-dialog"],
) as dag:

    @task
    def wait_seconds(seconds: int):
        sleep(seconds)

    a = wait_seconds.override(task_id="A")(3)
    b = wait_seconds.override(task_id="B")(30)
    c = wait_seconds.override(task_id="C")(3)

    a >> b >> c

Steps to reproduce

1. Deploy the Dag, enable it, and trigger a run.
2. Wait until A, B, and C have succeeded.
3. Open the completed run's Task Instances tab.
4. Click the clear action for task C.
5. Ensure only C is selected. Leave Past, Future, Upstream, Downstream, and Clear only failed tasks unselected.
6. Leave Prevent rerun if task is running checked and Keep task state and resume unchecked.
7. Click Confirm.

Actual result

The dialog flickers and reopens instead of completing the clear action. Task C remains successful with its original try number.

In the captured failed interactions, requests to
POST /api/v2/dags/{dag_id}/clearTaskInstances return HTTP 200 with
dry_run: true in their request payloads. No request with dry_run: false
was observed.

The attached recording shows the dialog behavior, a request payload with
dry_run: true, and the unchanged try number afterward.

What you think should happen instead?

Confirming the clear action should send the actual clear request and close the dialog after it succeeds. With the scheduler running and dependencies satisfied, task C should rerun and its try number should increase.

Operating System

macOS host, with Airflow running in Linux Docker containers.

Deployment

Docker-Compose

Apache Airflow Provider(s)

No response

Versions of Apache Airflow Providers

No response

Official Helm Chart version

Not Applicable

Kubernetes Version

No response

Helm Chart configuration

No response

Docker Image customizations

The beta reproduction used the official apache/airflow:3.4.0b1 image with a mounted reproduction Dag and local configuration. Main was tested using Breeze.

Anything else?

Sending a clear request directly with dry_run: false successfully reruns the task.

The behavior was observed in both Safari and Chrome. The attached recording shows the failed UI interaction and a request payload containing dry_run: true.

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