How to reproduce:
1. Create a new project
2. Open the Package Manager (Window->Package Manager)
3. At the top bar set Packages to show "Unity Registry"
4. Search for "In App Purchasing"
5. Expand the "In App Purchasing" Package to show all the versions

Expected results: The "In App Purchasing" Package version 4.1.1 exists
Actual results: The latest "In App Purchasing" Package version available is 4.0.3

Reproducible with: 2021.1.0a1, 2021.1.28f1, 2021.2.1f1, 2022.1.0a1, 2022.1.0a14
Not reproducible with: 2019.4.33f1, 2020.3.23f1, 2021.2.2f1, 2021.2.4f1, 2022.1.0a15, 2022.1.0a16

Note:
- The latest version can be installed via In-App Purchasing Settings (Edit->Project Settings...->Services->In-App Purchasing->Set up and enable In-App Purchasing->Install Latest Version)