CullingResults contain duplicated Terrain as many as ScriptableRenderContext.Cull calls

How to reproduce:
1. Open the user's attached "TerrainBug.zip" project
2. Open the "SampleScene" Scene
3. Select the "JustCallCull" GameObject in the Hierarchy window
4. Set the "Number Of Cull Calls" to 10
5. Observe the Terrain layer colors in the Scene view

Expected result: The Layer in the middle is brown
Actual result: The Layer in the middle is white

Reproducible with: 2019.4.26f1 (7.6.0), 2020.3.9f1 (10.5.0), 2021.1.8f1 (11.0.0), 2021.2.0a17 (12.0.0)

Note:

• Changing the "Number Of Cull Calls" from 1 to 10, the color switch from brown to a whiter color can be seen