Steps to reproduce:

1) Download attached project and open in Unity
2) Make sure Graphics API is set to Vulkan in the Player Settings
3) Build and Run "ExampleScene-Player" scene on a device
4) Press on device multi-window button(square)
5) Press on the application so it should be maximized again
Observe that application is not maximized

Expected result: Application should be maximized
Actual result: Application is not maximized

Reproduced with:
2018.1.0b11, 2018.1.0f1, 2018.2.0b1

Can't check with 2018.1.0b10 and lower, because either shader or PackMan Errors

Devices under testing:
Reproduced with:
VLNQA00129 Nvidia SHIELD Tablet*, OS:6.0.1, CPU:armeabi-v7a, GPU:NVIDIA Tegra

Not reproduced with:
VLNQA00003 Razer Phone*, OS:7.1.1, CPU:arm64-v8a, GPU:Adreno (TM) 540
VLNQA00128 Samsung SM N950F*, OS:8.0.0, CPU:arm64-v8a, GPU:Mali-G71

This error will be printed in the logcat after device multi-window button will be pressed:
04-16 13:03:21.389 680 698 W WindowAnimator: Failed to dispatch window animation state change.
04-16 13:03:21.389 680 698 W WindowAnimator: android.os.DeadObjectException
04-16 13:03:21.389 680 698 W WindowAnimator: at android.os.BinderProxy.transactNative(Native Method)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.os.BinderProxy.transact(Binder.java:503)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.view.IWindow$Stub$Proxy.onAnimationStopped(IWindow.java:542)
04-16 13:03:21.389 680 698 W WindowAnimator: at com.android.server.wm.WindowAnimator.updateWindowsLocked(WindowAnimator.java:286)
04-16 13:03:21.389 680 698 W WindowAnimator: at com.android.server.wm.WindowAnimator.animateLocked(WindowAnimator.java:678)
04-16 13:03:21.389 680 698 W WindowAnimator: at com.android.server.wm.WindowAnimator.-wrap0(WindowAnimator.java)
04-16 13:03:21.389 680 698 W WindowAnimator: at com.android.server.wm.WindowAnimator$1.doFrame(WindowAnimator.java:123)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:856)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.view.Choreographer.doCallbacks(Choreographer.java:670)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.view.Choreographer.doFrame(Choreographer.java:603)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.os.Handler.handleCallback(Handler.java:742)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.os.Handler.dispatchMessage(Handler.java:97)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.os.Looper.loop(Looper.java:148)
04-16 13:03:21.389 680 698 W WindowAnimator: at android.os.HandlerThread.run(HandlerThread.java:61)
04-16 13:03:21.389 680 698 W WindowAnimator: at com.android.server.ServiceThread.run(ServiceThread.java:46)
04-16 13:03:21.390 680 698 W WindowAnimator: Failed to dispatch window animation state change.