Terrain's base map is not updated when TerrainData.RefreshPrototypes and Terrain.Flush are called

Reproduction steps:
1. Open the attached “unity-terrain.zip“ project
2. Open the “Assets/Scenes/SampleScene.unity” Scene
3. Enter the Play Mode
4. Observe the “RawImage” GameObject’s color in the top left corner of the Game View and compare it to the Terrain’s color
5. Press “C”
6. Observe the “RawImage” GameObject’s color in the top left corner of the Game View and compare it to the Terrain’s color

Expected result: The “Terrain” GameObjects color matches the “RawImage” GameObject’s color
Actual result: The colors of both GameObjects don’t match

Reproducible with: 2020.3.47f1, 2021.3.22f1, 2022.2.13f1, 2023.1.0b11, 2023.2.0a9

Reproducible on: Windows 10 Pro (22H2)

Note: Pressing “” multiple time to increase the “basemapDistance” to 210 or above (the value is noted in the Console Window after pressing “”) fixes the issue