Reproduction steps:
1. Open the attached “Repro“ project
2. Open the “Assets/InstantiateTest/InstantiateTest.unity“ Scene
3. Enter the Play Mode
4. Press the 'A' button when the Game View is in focus
5. Observe the Console
6. Select the “PrefabRoot (Clone)“ GameObject in the Hierarchy
7. Observe the “Prefab Childs” list in the Inspector

Expected result: No errors are present and all of the “PrefabChild“ Child GameObjects are referenced in the list
Actual result: “Prefab Child is null!” error is thrown in the Console and only the last “PrefabChild“ Child GameObject is referenced in the list, others are missing

Reproducible with: 2022.3.42f1, 6000.0.15f1
Couldn't test with: 2021.3.42f1 ('InstantiateAsync()' is not available)

Reproducible on: M1 Max MacOS 14.5
Not reproducible on: No other environment tested

Notes:
- The issue is present on both Editor and Build. Instantiate() works as expected, but the issue is present with the InstantiateAsync() call
- Reproducible with Android Player