Reproduction steps:
1. Download and open the attached "MissingRefRepro.zip" project
2. Switch the build target to iOS
3. Go to "Support" > "Build bundles legacy"
4. Open the "SupportTest" scene
5. Enter "Play" mode
6. In the Inspector window, expand the "Bundles loaded" list
7. Double click on the "loading" item in the list
8. Switch to "Debug" mode
9. Expand the "Advanced Data" and "Preload Table" lists
10. Observe the Console window

Expected result: No warning appear in the Console window
Actual result: Several "Missing reference" warnings appear

Reproducible with: 2020.3.34f1
Could not test with: 2019.4, 2021.3, 2022.1, 2022.2 (Project breaks when downgrading/upgrading)