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Is there a known reason why kicking/waiting for sub flows in prefect 1 fails in the main flow even though the kicked flows actually succeed?

Did you try threaded <https://docs.prefect.io/orchestration/faq/faq.html#why-does-prefect-mark-flow-runs-with-no-heartbeat-detected-from-the-remote-task-marking-the-run-as-failed|heartbeats> already?

I haven't. I'll try it, thanks, though is it known why they sometimes perform better?

There is a theory that using processed mind cause some issues with the Python GIL

Does the option work both for cloud and self hosted?

0.15.4 and above :slightly_smiling_face:. That’s when the feature was added in