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Hi there! Sometimes our tasks get hung (attaching screenshots for the same), they remain in pending state when their upstream tasks are completed hours before and even after cancelling/restarting em, they won't start remain in pending state. This is happening with us like 3rd time, any possible reasons why it happens? or it is a bug in prefect 1.0?

it's hard to say why based on the current information set - check out those topics for troubleshooting <https://discourse.prefect.io/tag/stuck>

pending state means waiting for execution i.e. waiting to be picked up by the agent - if it doesn't get picked up, it's likely a label mismatch; if it does, then likely execution layer issue