GameObject does not get assigned a Parent when Instantiated in Edit Mode

Reproduction steps:
1. Open the attached “BugRepro” project
2. Open the “<path>/BasicDemo” Scene
3. In the Building Loader window (BuildingManager > Tools > BuildingLoader), paste the PersistedDataLine in Persisted Data text field
4. Set the Parent field to “Map/Buildings“ GameObject from the Hierarchy
5. Open the Container field Object Picker and select “Container_2.5”
6. Press “Load” button
7. In the Hierarchy window, observe the created “Map/Buildings/Building” GameObject and “DemoFloor_2.5(Clone)” GameObject

Expected result: The “DemoFloor_2.5(Clone)” GameObject is created as a child of the “Building” GameObject
Actual result: The “DemoFloor_2.5(Clone)” is created separately, with no parent

Reproducible with: 2022.3.24f1, 2023.2.18f1, 6000.0.0b14
Couldn't test with: 2021.3.37f1 (compilation error because of missing API)

Reproducible on: Windows 11
Not reproducible on: No other environment tested

Note: If step 6 is done while in Play Mode, the results are as expected