the change set it identifies is as follows

pulumi:pulumi:Stack: (same)
    [urn=urn:pulumi:dev::iac-lab2-ec2::pulumi:pulumi:Stack::iac-lab2-ec2-dev]
    ++aws:ec2/instance:Instance: (create-replacement)
        [id=i-055c1e578277fdd23]
        [urn=urn:pulumi:dev::iac-lab2-ec2::aws:ec2/instance:Instance::pulumi_made]
        [provider=urn:pulumi:dev::iac-lab2-ec2::pulumi:providers:aws::default_4_29_0::7d347e6c-5fb5-4e2b-bc1f-f2e5ff067bf1]
      ~ ebsBlockDevices: [
          ~ [0]: {
                  ~ deleteOnTermination: true => true
                  ~ deviceName         : "/dev/sda1" => "/dev/sda1"
                  + volumeSize         : 10
                }
        ]
    +-aws:ec2/instance:Instance: (replace)
        [id=i-055c1e578277fdd23]
        [urn=urn:pulumi:dev::iac-lab2-ec2::aws:ec2/instance:Instance::pulumi_made]
        [provider=urn:pulumi:dev::iac-lab2-ec2::pulumi:providers:aws::default_4_29_0::7d347e6c-5fb5-4e2b-bc1f-f2e5ff067bf1]
      ~ ebsBlockDevices: [
          ~ [0]: {
                  ~ deleteOnTermination: true => true
                  ~ deviceName         : "/dev/sda1" => "/dev/sda1"
                  + volumeSize         : 10
                }
        ]
    --outputs:--
  ~ hostname: "<http://ec2-52-90-186-159.compute-1.amazonaws.com|ec2-52-90-186-159.compute-1.amazonaws.com>" => output<string>
  ~ ip      : "52.90.186.159" => output<string>
    --aws:ec2/instance:Instance: (delete-replaced)
        [id=i-055c1e578277fdd23]
        [urn=urn:pulumi:dev::iac-lab2-ec2::aws:ec2/instance:Instance::pulumi_made]
        [provider=urn:pulumi:dev::iac-lab2-ec2::pulumi:providers:aws::default_4_29_0::7d347e6c-5fb5-4e2b-bc1f-f2e5ff067bf1]

hmm this doesn't look right, I wonder if it's a bug. Could you open an issue in github.com/pulumi/pulumi-aws

sure thanks!