kaxil opened a new issue, #47784: URL: https://github.com/apache/airflow/issues/47784
### Body When using a DAG with Mapped Task Group, it fails when clicking on the mapped task in the Grid View   Error: ``` 404 Not Found The Mapped Task Instance with dag_id: `branching_issue`, run_id: `manual__2025-03-14T12:04:11.471638+00:00_uvW0b3sy`, task_id: `showcase_branching_issues.branch_int`, and map_index: `-1` was not found ``` Dag file to reproduce: ```python from datetime import datetime from airflow.decorators import dag, task, task_group @dag( dag_id="branching_issue", schedule=None, start_date=datetime(2021, 1, 1), ) def BranchingIssue(): @task def branch_b(): pass @task def branch_a(): pass @task def initiate_dynamic_mapping(): import random random_len = random.randint(1, 6) return [i for i in range(random_len)] @task.branch def branch_int(k): import time branch = "showcase_branching_issues." if k % 2 == 0: branch += "branch_a" else: time.sleep(5) branch += "branch_b" return branch @task_group def showcase_branching_issues(k): selected_branch = branch_int(k) selected_branch >> [branch_a(), branch_b()] list_k = initiate_dynamic_mapping() showcase_branching_issues.expand(k=list_k) dag = BranchingIssue() ``` ### Committer - [x] I acknowledge that I am a maintainer/committer of the Apache Airflow project. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
