To reproduce
- Open a new unity project
- Add a Light Probe Group (Gameobject -> Lighting -> Light Probe Group)
- Change the transform position to (0,0,0)
- Add a sphere gameobject (Gameobject -> 3DObject -> Sphere)
- Position sphere inside the light probe (change transform position to 0,0,0)
- Select the light probe group gameobject in the hierarchy

Expected result:
There should be 8 probes around the sphere (like in the screenshot)

Actual result:
No spheres are visible

Platform:
Tested on windows 10

Tested in in 2019.3.0b7, 2019.3.0a11, 2019.3.0b1, 2019.3.0b3, 2019.3.04, 2019.3.0b5, 2019.3.0b6 , 2020.1.0a8, 2020.1.0a4, 2020.1.0a3

Reproducible in 2019.3.0b7, 2019.3.0b6 , 2020.1.0a8, 2020.1.0a4, 2020.1.0a3