I can not access the environmental variable from Secret Manager that I passed in the secretEnv in Google Cloud Build

Question

steps:
  - name: gcr.io/cloud-builders/docker
    entrypoint: bash
    args:
      - '-c'
      - |
        docker pull $_AR_HOSTNAME/$PROJECT_ID/cloud-run-source-deploy/$REPO_NAME/$_SERVICE_NAME:latest || exit 0
    id: Pull docker cache
  - name: gcr.io/cloud-builders/docker
    args:
      - build
      - '-t'
      - $_AR_HOSTNAME/$PROJECT_ID/cloud-run-source-deploy/$REPO_NAME/$_SERVICE_NAME:$COMMIT_SHA
      - '-t'
      - $_AR_HOSTNAME/$PROJECT_ID/cloud-run-source-deploy/$REPO_NAME/$_SERVICE_NAME:latest
      - .
      - --cache-from
      - $_AR_HOSTNAME/$PROJECT_ID/cloud-run-source-deploy/$REPO_NAME/$_SERVICE_NAME:latest
    id: Build
  - name: gcr.io/cloud-builders/docker
    args:
      - run
      - '--rm'
      - $_AR_HOSTNAME/$PROJECT_ID/cloud-run-source-deploy/$REPO_NAME/$_SERVICE_NAME:$COMMIT_SHA
      - bash
      - '-c'
      - |
        export DEBUG=true
        echo
        env
        python manage.py test
    secretEnv: ['DJANGO_SECRET']
      - GCP_INFOS
    id: Test
  - name: gcr.io/cloud-builders/docker
    args:
      - push
      - >-
        $_AR_HOSTNAME/$PROJECT_ID/cloud-run-source-deploy/$REPO_NAME/$_SERVICE_NAME:$COMMIT_SHA
    id: Push
  - name: 'gcr.io/google.com/cloudsdktool/cloud-sdk:slim'
    args:
      - run
      - services
      - update
      - $_SERVICE_NAME
      - '--platform=managed'
      - >-
        --image=$_AR_HOSTNAME/$PROJECT_ID/cloud-run-source-deploy/$REPO_NAME/$_SERVICE_NAME:$COMMIT_SHA
      - >-
        --labels=managed-by=gcp-cloud-build-deploy-cloud-run,commit-sha=$COMMIT_SHA,gcb-build-id=$BUILD_ID,gcb-trigger-id=$_TRIGGER_ID
      - '--region=$_DEPLOY_REGION'
      - '--quiet'
    id: Deploy
    entrypoint: gcloud

availableSecrets:
  secretManager:
    - versionName: projects/$PROJECT_ID/secrets/DJANGO_SECRET/versions/latest
      env: "DJANGO_SECRET"

I tried to add this step just for testing purpose:

  - name: 'gcr.io/google.com/cloudsdktool/cloud-sdk:slim'
    entrypoint: bash
    args:
      - '-c'
      - |
        echo "Fetching DJANGO_SECRET from Secret Manager..."
        echo "$(gcloud secrets versions access latest --secret="DJANGO_SECRET")"
    id: Get gcloud secrets for testing purpose

Here it correctly prints out the variable, which means that I correctly gave the permission to Cloud build and also the variable name is correct. However, with the above method it does not work, where I just provide the environmental variable as secretEnv

I gave both the Secret Manager viewer and Secret Manager admin (just in case) permissions to project_id@cloudbuild.developer.com, and also the environmental variable is availabe in the Secret manager.

It fails in the Test step, when I print env, it does not have the DJANGO_SECRET inside there. How to solve it? I tried to check all the links, and did in the exact same way, but still not able to handle this.