How to reproduce:
1. Open the attached "mipstripping" project
2. Open the Scene "SampleScene"
3. Open the Build Settings (File->Build Settings...)
4. Make sure the "SampleScene" is in the Scenes In Build list
5. Build And Run the project

Expected results: The image is rendered the same as in the Editor
Actual results: The image is corrupted

Reproducible with: 2020.1.0a20, 2020.1.16f1, 2020.2.0b14, 2021.1.0a8
Could not test with: 2020.1.0a19 and earlier because the "Texture Mipmap Stripping" option was not yet introduced

Notes:
- These are the exact conditions for the issue to reproduce:
The "Texture Mipmap Stripping" option in the Player Settings has to be enabled
The corresponding texture has "Use crunch compression" enabled in the Import settings.
Quality Settings is configured so all of the active quality levels have a "Texture Quality" different from 'Full res' (so mipmap stripping can actually be performed)
- The issue has been reproduced on Nintendo Switch, Windows, macOS