GitHub user potiuk added a comment to the discussion: DagNotFound - Dag already 
exists and and it failed one time with dag_id not found

This is not airflow issue - this is at most a discussion where you need help 
with your problem. Most likely the solution you chose for DAG synchronisation 
is not perfect. There seem to be some race condition that your worker does not 
have the dag file present in the folder it expects. For example if you have 
custom DAG syncing solution, it might be that you delete files before you 
recreate them. Or maybe the syncing in a new pod is not complete when your task 
starts. This - in k8s environment is usually handled by init container that 
syncs the files before starting the task.

Generally - look at your DAG syncing deployment choice you made and fix it so 
that you can be 100% sure that DAG files are present when tasks are running.

GitHub link: 
https://github.com/apache/airflow/discussions/43728#discussioncomment-11164142

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