What is the best practices to do a Wwise cleanup before or upon closing the game?

Question

We are using unreal wwise integration, and we met a problem recent days:

For the packaged verson of game, let's say Game.exe, when we click the exit button in Game.exe, it will call a UE's default "QuitGame" BP node to do closing. And we find that UI and viewport of Game.exe is disappeared, but the exe process is still run in background.

I attached visual studio debugger to that Game.exe to see what happed in it, it reflects that the GameThread is stucked at "FWwiseResourceLoader::UnloadEvent", and the event under unloading seems just normal. But mostly it was a DurationType="Infinite" event.

part of the thread stack I listed here:

xxx(number of an address)

xxx(number of an address)

FEventWin::Wait

FEvent::Wait

FFutureState::WaitFor

FFutureBase<>::WaitFor

FFutureBase<>::Wait

FWwiseResourceLoader::UnloadEvent

UAkAudioEvent::UnloadEventData

UObject::ConditionalBeginDestroy

......(Other stacks seems no-relate to wwise)

Does anyone know what happened? Is there anything that we should do before closing the game for wwise? (We tried StopAll, but it doesn't work...)