How to reproduce:
1. Open user attached project "HLOD Test.zip"
2. Open "SampleScene" scene
3. Hold and move the mouse cursor in the Game View
4. Observe the Console Window

Expected result: Exception is not being spammed
Actual result: "System.ArgumentException: The entity does not exist" is being spammed

Reproducible with - 2019.4.7f1, 2020.1.1f2, 2020.2.0a21
Could not test with - 2018.4.25f1 (errors)
Package reproducible with - 0.5.0-preview.6, 0.8.0-preview.18

Notes:
1) Not reproducible with HybridRendererV2
2) Unloading the sub scenes stops throwing "System.ArgumentException: The entity does not exist"