{
  "sdk": {
    "version": "7.0.100-preview.1.22110.4",
    "rollForward": "patch"
  },
  "msbuild-sdks": {
    "Microsoft.Build.Traversal": "3.1.6"
  }
}

{
  "sdk": {
    "version": "7.0.100-preview.2.22153.17",
    "rollForward": "patch"
  },
  "msbuild-sdks": {
    "Microsoft.Build.Traversal": "3.1.6"
  }
}

Use .NET 7 preview 2
Use .NET 7 preview 2

