How to reproduce:
1. Unzip the "Project.zip" project.
2. Change the platform to iOS.
3. Build the Addressables
Window > Asset Management > Addressables > Groups ---> Build > New Build > Default Build Script
4. Build the project for iOS
5. Build & Run the project to a device via Xcode

Actual result: Error is thrown in the Xcode console
Expected result: No error is thrown.

Reproducible with: 2018.4.13f1, 2019.2.13f1, 2019.3.0b11, 2020.1.0a13.

Devices Reproducible with:
- iPhone 8 Plus (iOS 12.1.2)
- VLNQA00290, Samsung Galaxy S10 5G (SM-G977U), Android 9, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640

Notes:
- Full error:
Could not produce class with ID 91.
This could be caused by a class being stripped from the build even though it is needed. Try disabling 'Strip Engine Code' in Player Settings.
- The error appears when "Addressables.LoadAssetAsync<GameObject>(path).Completed += OnLoadedAsset;" is present.