Hey all, we're seeing weird behavior with Prefect Cloud jobs when a single flow run is picked up by two ECS tasks and both execute the flow simultaneously.
The logs in Prefect Cloud then appear duplicated, and one of the ECS tasks eventually fails with exception
prefect.exceptions.MissingResult: The result was not persisted and is no longer available
We observed this issue three times, first one on Saturday, then Monday, and today. This is the first time we encountered this issue after using Prefect Cloud for over 2 years now.
We're using ECS Push work pools.
Does anyone experience the same issue?
n
Nate
11/26/2025, 8:58 PM
hey @Jakub Roman can you DM a flow run url where this occurred? ideally for both that are picked up
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