[ansible/ansible] Fix issue #87359: hostvars undefined regression in group_vars

Job description

Fix GitHub issue 87359 in ansible/ansible: https://github.com/ansible/ansible/issues/87359 Repo: https://github.com/ansible/ansible Target: Clear regression with minimal reproducer, explicit failing behavior, and a scoped core logic or documentation fix path that appears one PR tractable. Required deliverables: A real code change upstream against ansible/ansible. An upstream pull request linked to issue 87359. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and e967b2cd 3f1a 4a2e bb93 9ae62de472a5 or https://openjobs.bot/jobs/e967b2cd 3f1a 4a2e bb93 9ae62de472a5 in the PR body or linked issue comment.