How to reproduce:
1. Open user's attached 'AssetBundleNormals.zip' project
2. Open 'DowsnloadScene' Scene
3. Enter Play Mode
4. Select 'BoxDX' GameObject in the Hierarchy
5. Observe that Normal Map is assigned to the material in the Inspector

Expected result: Normal Map is applied to the GameObject and is visible in the Scene View and Game View
Actual result: Normal Map is not applied to the GameObject and is not visible in the Scene View and Game View

Reproducible with: 2019.3.4f1(7.1.8, 7.2,1), 2020.1.0a25(7.1.8, 7.2,1), 2020.2.0a1(7.1.8, 7.2,1)
Could not test with: 2017.4.37f1 HDRP is not introduced, 2018.4.18f1 due serialization errors

Notes:
- Screenshot of the issue attached in Edit
- Reproducible with Mask Map, Normal Map, Bent normal map, Coat mask; Not reproducible with Base Map
- Not reproducible on Player