How to reproduce:
1. Create and open a new Project
2. Install the “In-App Purchasing” Package
3. Select the “Unity.Purchasing.Security” Assembly Definition in the Editor (Packages/In-App Purchasing/Runtime/Security)
4. Observe the Inspector Window
Actual result: Error message “Unknown platform: ‘Lumin’ ; Parameter name: Lumin” is present in the Inspector
Expected result: No error message regarding “Lumin”
Reproducible with: 4.15.1 (6000.0.81f1), 5.4.2 (6000.0.81f1)
Reproducible on: macOS 26.5.2 (M3 Pro)
Not reproducible on: No other environment tested
Notes:
- The error message does not prevent the application from being built
- Error message prevents visual information in the Inspector Window for the Assembly Definition
- Reproducible on all Package versions as Lumin and Stadia was removed as platforms in the Editor