MWAA inconsistent tasks states

Hi,

We are using MWAA with 2.6.3 version of Airflow, mw1.small, 2 schedulers, 1-12 workers. Every now and then, maybe once a month, in a DAG with multiple tasks, there is something strange happening - an upstream task is marked with success status, but the following downstream task fails with upstream_failed status.

There is nothing in the Airflow task logs indicating why it happened. Also, there are other users who observe similar behaviour, for example, here: https://github.com/apache/airflow/discussions/33528 . The Airflow devs suggest that it is specific to MWAA. How to investigate the issue? It is not possible to reproduce it intentionally, and there is no pattern for such behavior.