Data Security → Control Access to Objects challenge: Recruiting objects (Position, Candidate, Job Application, Review) missing from all Trailhead Playgrounds

Hello Sir/Madam,

I am trying to complete the Data Security → Control Access to Objects challenge, but I am unable to proceed because the required Recruiting objects are missing.

I checked multiple Trailhead Playgrounds, including newly created ones, and I cannot find the following objects:

• Position
• Candidate
• Job Application
• Review

I verified:

• Object Manager does not contain these objects.
• Permission Set → Object Settings does not show Position.
• Installed Packages only contain Salesforce Connected Apps and Trailhead Playground.

Because the Position object is missing, I cannot grant the required Read, Create, and Edit permissions for the Manage Positions permission set.

Has anyone found a solution recently? Is there a package that needs to be installed, or is this a known issue with the challenge?

Thank you.