Steps to reproduce:

1) Download attached project and open in Unity
2) Make sure only Vulkan Graphics API is set in the Player Settings >> Other Settings >> Graphics APIs
3) Build and run project on a device
4) After application is launched, press the square "recent apps" button
Observe blurry transition (check attached video "reproTransition.mp4")

Expected result: Transition between the launched app and recent apps window should not be blurry when using Vulkan graphics API
Actual result: Transition between the launched app and recent apps window is blurry when using Vulkan graphics API

Reproduced with:
2018.1.0b13, 2018.3.0a1

Devices under testing:
Google Pixel 2 XL, OS:8.1.0, CPU:arm64-v8a, GPU:Adreno (TM) 540
Google Pixel C, OS:8.1.0, CPU:arm64-v8a, GPU:NVIDIA Tegra
Nvidia SHIELD Tablet, OS:6.0.1, CPU:armeabi-v7a, GPU:NVIDIA Tegra
Razer Phone, OS:7.1.1, CPU:arm64-v8a, GPU:Adreno (TM) 540
Samsung SM G960F, OS:8.0.0, CPU:arm64-v8a, GPU:Mali-G72
Samsung SM N950F, OS:7.1.1, CPU:arm64-v8a, GPU:Mali-G71

Note: Not reproduced using Gles3 graphics API

Tested using "com.unity.render-pipelines.lightweight": "1.1.2-preview" version of LTSRP