Reproduction steps:
1. Open the attached “Terrain.zip” project
2. Open the “SampleScene”
3. Enter the Play mode
4. Observe the Game View
5. Exit Play mode
6. Build and Run the Project (File > Build and Run)
7. Observe the Build result

Expected result: Build looks the same as in the Play mode, all Detail objects are being rendered and move with the terrainData.wavingGrassAmount function
Actual result: Detail objects are not moving with the terrainData.wavingGrassAmount function and Grass Billboards are not rendered

Reproducible with: 2021.3.34f1
Couldn't test with: 2022.3.19f1, 2023.2.8f1, 2023.3.0b5 (Detail objects did not load in the Play mode)

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