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Reading this, and the related documentation I think I figured out what caused the problems for me.
We usually deploy from Jenkins, using Linux-based Pulumi container. But sometimes I also deploy from my laptop, which is a Windows 11 machine. The conflict is because Pulumi uses the name of the executable as the "manager". So it conflicts, because from Linux it's `manager: pulumi-resource-kubernetes`, but from Windows it's `manager: pulumi-resource-kubernetes.exe`. And since these are different, Pulumi thinks there is a conflict.