Steps to reproduce:
1. Open user attached project
2. Run the scene in the editor
3. Press "Generate" button add one white rectangle
- In editor a new white rect will be added to the RT
4. Build and run the test scene on an Android device
5. Press "Generate" button to add one white rectangle
- This time a clear will occur on the RT before the new rect is added

Expected result: a clear in render texture should not occur before a new rect is added on Vulkan

Does not occur in: 2018.3.0a1, 2018.2.0b8, 2018.2.0a1
Reproduced in: 2018.1.3f1, 2017.4.3f1, 2017.3.2f1, 2017.2.3p1

Reproduced with:
Samsung Galaxy S8, Android 8.0, GPU: Mali-G71
Samsung Galaxy S9, Android 8.0, GPU: Mali-G72

Does not reproduce with:
HTC 10, Android 7.0, GPU: Adreno 530
Google Pixel 2, Android 8.0, GPU: Adreno 540

Fixed in: 2018.2.11f1