Steps:
1. Create a new project
2. Add Plane
3. Add empty GameObject
4. Add LightProbesGroup on that empty GameObject
5. Select Plane
6. Use Hierarchy search to find something that is not exists in Hierarchy (e.g. 111111)
==>
All the ojbects are greyed out but we see also Light Probes gizmos

Take a look into attached movie for details

[A2] Scenario:
1. Get latest from Perforce for the a2 repository
2. Open Tools->Windows->ProjectTools
3. Ensure GameConfig_FPSSample is set
4. Click the Open Level_00
5. Ensure scene looks normally (SceneView toggle for Scene Lighting should be enabled)
6. Enter a search value that doesnt match anything
7. Notice that Light Probe gizmos starts rendering on the grey-out filter