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That doesnt sound expected. If you have a repro for this, could you open a GitHub issue with details?

Can you please send me the code that you are running for this please

create an AWS pulumi project and run

pulumi up

2 times and you will get this on second run:

Type                 Name                   Plan        Info
     pulumi:pulumi:Stack  aws2_rest-aws2_rest_s              1 message
 +-  └─ aws:ec2:Instance  aws2-eu1tst-test1      replace     [diff: ~ebsBlockDevices]

const myVpc = new aws.ec2.Vpc("myVpc", {     cidrBlock: "10.0.0.0/16",     tags: {         Name: "DemoVpc",     }, }); const mySubnet = new aws.ec2.Subnet("mySubnet", {     vpcId: myVpc.id,     cidrBlock: "10.0.0.0/16",     tags: {         Name: "DemoSubnet",     }, }); const fooNetworkInterface = new aws.ec2.NetworkInterface("ExcelNetworkInterface", {     subnetId: mySubnet.id,     privateIps: ["10.0.0.100"],     tags: {         Name: "primary_network_interface",     }, }); const fooInstance = new aws.ec2.Instance("fooInstance", {     ami: "ami-008806d238cf70838",     instanceType: "t2.micro",     networkInterfaces: [{         networkInterfaceId: fooNetworkInterface.id,         deviceIndex: 0,     }],     creditSpecification: {         cpuCredits: "unlimited",     }, });