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What was the failure?  If the resource creation fails without reporting back the id of the resource, there is no way for Pulumi to track the existence of the leaked resource. We go to lengths to ensure we never lose track of a created resource in the Pulumi layer - but there may be bugs in underlying clouds or upstream resource providers that could lead to this. If you have a repro - opening an issue would be great. 

Thanks <@UB3BGTV63>, I couldn't repro the issue since then.