To reproduce:

1. Download attached “LWRP-GLES2.zip" project and open in Unity
2. Open "TEST" scene
3. Change the platform to iOS or Android
4. Build for iOS or Android
5. Deploy built App to a Device

Expected Result: When App is opened in a Device, you will see a Cube with a Shadows
Actual Result: When App is opened in a Device, you will see a Cube without a Shadows or just a black Plane

Notes:
- This issue appears on iOS and Android devices which support only OpenGL ES 2.0
- On OpenGL ES 3.0 this issue does not appear
- Images for Reference and snippet from the Player log are attached in Comments section

- iPod Touch 6th Gen, iOS: 10.2.1 - Not Reproduced
- iPad Air, iOS: 11.0 - Not Reproduced
- iPhone 8 Plus, iOS: 12.2 - Not Reproduced
- iPhone X, iOS: 13.0 - Not Reproduced
- iPad mini, iOS: 9.3.5 - Reproduced
- iPhone 5C, iOS: 9.3.2 - Reproduced

Reproduced on Package version 5.2.1, 5.3.1, 5.16.1 and 6.5.3

Reproduced on Unity 2019.1.9f1, 2019.2.0b8 and 2019.3.0a8