joelossher opened a new issue, #23546:
URL: https://github.com/apache/airflow/issues/23546
### Apache Airflow version
2.2.5
### What happened
After a task was deleted from a DAG we received the following message when
visiting the gantt view for the DAG in the webserver.
{
"detail": null,
"status": 404,
"title": "Task delete-me not found",
"type":
"https://airflow.apache.org/docs/apache-airflow/2.2.5/stable-rest-api-ref.html#section/Errors/NotFound";
}
This was only corrected by manually deleting the offending task instances
from the `task_instance` and `task_fail` tables.
### What you think should happen instead
I would expect the gantt chart to load either excluding the non-existent
task or flagging that the task associated with task instance no longer exists.
### How to reproduce
* Create a DAG with multiple tasks.
* Run the DAG.
* Delete one of the tasks.
* Attempt to open the gantt view for the DAG.
### Operating System
Debian GNU/Linux 11 (bullseye)
### Versions of Apache Airflow Providers
_No response_
### Deployment
Other Docker-based deployment
### Deployment details
Custom docker container hosted on Amazon ECS.
### Anything else
_No response_
### Are you willing to submit PR?
- [X] 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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