Greengrass does not remove old images after updating the deployment more than 3 times

Hi,

We are using nucleus version 2.12.1. Documents say greengrass should remove images from older deployments but it is not removing even after we make 5-6 deployments. Here is our sample component recipe:

{
  "RecipeFormatVersion": "2020-01-25",
  "ComponentName": "App1",
  "ComponentVersion": "5.0.0",
  "ComponentType": "aws.greengrass.generic",
  "ComponentDescription": "A component that uses docker run and greengrass to do a task on edges",
  "ComponentPublisher": "Some Publisher",
  "ComponentConfiguration": {
    "DefaultConfiguration": {
      "preDeploymentScript": " ",
      "deploymentExtraArguments": "",
      "postDeploymentScript": " ",
      "filesToUpload": " "
    }
  },
  "ComponentDependencies": {
    "aws.greengrass.DockerApplicationManager": {
      "VersionRequirement": ">=2.0.0 <2.1.0",
      "DependencyType": "HARD"
    },
    "aws.greengrass.TokenExchangeService": {
      "VersionRequirement": ">=2.0.0 <2.1.0",
      "DependencyType": "HARD"
    }
  },
  "Manifests": [
    {
      "Platform": {
        "os": "all",
        "architecture": "all"
      },
      "Lifecycle": {
        "Install": {
          "script": "docker pull app1:1.0",
          "RequiresPrivilege": true,
          "Timeout": 3600
        },
        "Run": {
          "script": "docker run -e AWS_CONTAINER_AUTHORIZATION_TOKEN -e AWS_CONTAINER_CREDENTIALS_FULL_URI  --name app1 --network host  app1:1.0",
          "RequiresPrivilege": true
        },
        "Shutdown": {
          "script": "docker stop app1 && docker rm app1",
          "RequiresPrivilege": true
        }
      },
      "Artifacts": []
    }
  ],
  "Lifecycle": {}
}