How to reproduce:
1. Open the attached “IN-113396“ project
2. Open the “Map” scene (Assets/Scenes/Map)
3. Select the Game tab
4. Navigate to Assets/Test
5. In the project tab, right click and select Reimport
6. Select the Scene tab
7. Observe the Scene view

Expected result: The entire structure casts shadows
Actual result: Some parts of the structure do not cast shadows

Reproducible with: 6000.0.15f1, 6000.0.56f1, 6000.2.0a8, 6000.3.0a6
Couldn’t test with: 6000.0.14f1 (Multiple issues downgrading the project), 6000.2.2f1 (Different bug obstructs the issue)

Reproducible on: Windows 11, macOS Sequoia 15.6 (M1)
Not reproducible on: No other environments tested

Notes:
- If domain reload is performed with objects visible, the issue will not reproduce until Play mode is entered and exited
- Entering and exiting Play mode fixes the issue