Cache in CI is removed and then restored

GitLab CI/CD
,
1

Using this pipeline and setting one runner for all jobs and a global cache to share .terraform folder across multiple envs I expected that .terrafrom folder will be shared among all jobs but I see that it first removes .terraform.lock.hcl, .terraform and plan.cache and then restores the cache, why?

Screenshot 2023-02-07 at 15.26.16
Screenshot 2023-02-07 at 15.26.161870×1094 304 KB 

image: registry.gitlab.com/gitlab-org/terraform-images/releases/1.3:latest

default:
    tags:
        - docker

variables:
  TF_ROOT: ${CI_PROJECT_DIR}

before_script:
  - terraform --version
  - cd ${TF_ROOT}


cache:
  key: "$CI_COMMIT_REF_SLUG"
  paths:
    - ${TF_ROOT}/.terraform/

stages:
  - validate
  - build
  - apply
  - destroy

.validate-base:
  stage: validate
  script:
    - gitlab-terraform validate

.terraform:plan:
  stage: build
  script:
    - gitlab-terraform plan -var-file ${TF_STATE_NAME}.tfvars
  artifacts:
    paths:
      - ${TF_ROOT}/plan.cache
    name: ${TF_STATE_NAME}
  resource_group: ${TF_STATE_NAME}
  when: manual

.terraform:apply:
  stage: apply
  script:
    - gitlab-terraform apply
  resource_group: ${TF_STATE_NAME}
  when: manual

.terraform:destroy:
  stage: destroy
  script:
    - gitlab-terraform destroy -var-file ${TF_STATE_NAME}.tfvars
  resource_group: ${TF_STATE_NAME}
  when: manual

.environment:sandbox:
  variables:
    TF_STATE_NAME: sandbox

.environment:dev:
  variables:
    TF_STATE_NAME: dev

.environment:production:
  variables:
    TF_STATE_NAME: production
  only: 
    - tags

validate-sandbox:
  extends:
    - .validate-base
    - .environment:sandbox

plan-sandbox:
  extends:
    - .terraform:plan
    - .environment:sandbox
  needs: [validate-sandbox]

apply-sandbox:
  extends:
    - .terraform:apply
    - .environment:sandbox
  needs: [plan-sandbox]

destroy-sandbox:
  extends:
    - .terraform:destroy
    - .environment:sandbox

plan-dev:
  extends:
    - .terraform:plan
    - .environment:dev
  needs: [validate-sandbox]

apply-dev:
  extends:
    - .terraform:apply
    - .environment:dev
  needs: [plan-dev]

destroy-dev:
  extends:
    - .terraform:destroy
    - .environment:dev

plan-prod:
  extends:
    - .terraform:plan
    - .environment:production
  needs: [validate-sandbox]

apply-prod:
  extends:
    - .terraform:apply
    - .environment:production
  needs: [plan-prod]

destroy-prod:
  extends:
    - .terraform:destroy
    - .environment:production