Reproduction steps:
1. Open attached project "HybridRenderer.zip" and scene "SampleScene"
2. Enter Play Mode
3. In Game View, observe the two "Debug Overlay Cell" GameObjects

Expected result: Both GameObjects are rendered with the same color
Actual result: The GameObject that's converted to an Entity is lighter

Reproducible with: 0.11.0-preview.42 (2020.3.4f1, 2021.1.3f1)
Could not test with: 2018.4.34f1, 2019.4.24f1, 2021.2.0a13 (package errors break project)

Note:
Reproducible with Hybrid Renderer V2 in 2020.3.0f1, but when upgrading the project, the entity is no longer rendered and an error is logged in the Console - "A Hybrid Renderer V2 batch is using the shader "Shader Graphs/DebugCellOverlay", but the shader is either not compatible with Hybrid Renderer V2, is missing the DOTS_INSTANCING_ON variant, or there is a problem with the DOTS_INSTANCING_ON variant." Turning off Hybrid Renderer V2 fixes the issue.