OpenRL error occurred: RL_INVALID_VALUE errors are thrown continuously on erasing the Painted holes.

Steps to repro:
1. Create a new project.
2. GameObject > 3D > Terrain.
3. Select the Paint Texture tab > Select Paint Holes option.
4. Create Holes on Terrain.
5. Erase all Holes on the Terrain (Shift + Click).

Actual Result:
Errors are thrown in the console.

Expected Result:
No errors in the console.

Workaround is to either:
- Stop the bake, clear baked data and rebake;
- Use GPU Lightmapper or Enlighten for baking.

Reproducible in:
2020.1.0a15, 2019.3.0f3 (d719fa0632c6), 2019.3.0f2 (027dc118ae78), 2019.3.0f1, 2019.3.0b10, 2019.3.0b9;

Working fine in:
2019.3.0b8

Environment:
Only on Windows 10.

Stack trace:

OpenRL reported error code 501: OpenRL error occured: RL_INVALID_VALUE: Primitive "cec7835c52d9c5dfb28dbaa4827992e6:0" contains invalid texture "000001458F07BD80" in uniform "Transmission".