Steps to reproduce:

1. Open Scene "empty"
2. Ovserve that there is a cube, receving light from light probe group in the scene
3. Run the project and press Q
4. Observe that now cube are receiving red light from light probe group from second scene
5. Press W. Second scene was unloaded and LightProbes.Tetrahedralize() was called, but cube still receiving indirect red light from the second scene

Regression introduced in Version 2019.3.0.