Steam VR Not Exiting Games - HTC VIVE for UE4 games

Hi , the issue i have and i thought its only my game but seems almost all ue4 games have same issue which is when you exit the game from steam vr overlay the game stuck in exiting mode . but if you exit from ingame menu then its fine . the problem should be solve with updating ue4 engine but i tried the latest engine which is 4.16 and the problem still the same .

Any idea how to fix it ?

Any help guys ?