Reproduction steps:
1. Open attached project "UGUIDemo.zip" and scene "test"
2. Enter Play Mode, observe Console window
3. Exit Play Mode
4. In AssetBundles window, observe the dependencies of 'ui0' and 'ui1' (Advanced Data -> Dependencies)
5. In Project window, Assets/StreamingAssets folder, examine dependencies in 'ui0.manifest' and 'ui1.manifest' files

Expected result: Console output, AssetBundles window, and manifest files all list the same dependencies
Actual result: AssetBundles window displays dependencies, Console output and manifest files don't list any dependencies

Reproducible with: 2019.4.18f1, 2020.2.2f1, 2021.1.0b2, 2021.2.0a1
Could not test with: 2018.4.30f1 (compilation errors)