fix: infinite loop on hidden namespace

[dbadura]

Description

Changes proposed in this pull request:

• use memo to cache hiden namespace

Related issue(s)

Definition of done

• [x] The PR's title starts with one of the following prefixes:
  • feat: A new feature
  • fix: A bug fix
  • docs: Documentation only changes
  • refactor: A code change that neither fixes a bug nor adds a feature
  • test: Adding tests
  • chore: Maintainance changes to the build process or auxiliary tools, libraries, workflows, etc.
• [ ] Related issues are linked. To link internal trackers, use the issue IDs like backlog#4567
• [x] Explain clearly why you created the PR and what changes it introduces
• [x] All necessary steps are delivered, for example, tests, documentation, merging