I am experiencing another strange issue today. I have an azure-nextgen project that is simply creating a new resource group with a bunch of tags assigned. Deployment works fine. If I go in to Azure and delete some of the Tags though and try to redeploy via "pulumi up -r" the tags aren't replaced and Pulumi reports that the 2 resources (the stack and the resource group) were unchanged. During the preview stage of the up process though I do see the attached message saying that the tags differ.