お疲れ様です。
１．キーボードショートカットからToggleDebugCameraを実行するというのは、具体的にはどのような設定、実装を指しておりますでしょうか？
→PIE実行後、セミコロンキーからのToggleDebugCameraになります。
２．パッド操作←→キーボード操作では問題無く
→操作が切り替わった際に、クラッシュ時と同じ箇所が実行されるのですが、その際は問題ありません。
３．コールスタックは下記になります（プロジェクトコード部分は隠してあります）
UEnhancedInputUserSettings::GetSaveFilename(const ULocalPlayer *) EnhancedInputUserSettings.cpp:795
UEnhancedInputUserSettings::LoadOrCreateSettings(ULocalPlayer *) EnhancedInputUserSettings.cpp:638
>> project
XXXX::PlayerControllerChanged(APlayerController *) XXXX.cpp:384
<< project
[インライン化] UE::Core::Private::Function::TFunctionRefBase::operator()(ULocalPlayerSubsystem *) Function.h:471
`FObjectSubsystemCollection<ULocalPlayerSubsystem>::ForEachSubsystem’::`2’::<lambda_1>::operator()(USubsystem *) SubsystemCollection.h:231
[インライン化] UE::Core::Private::Function::TFunctionRefBase::operator()(USubsystem *) Function.h:471
FSubsystemCollectionBase::ForEachSubsystemOfClass(UClass *, TFunctionRef<…>) SubsystemCollection.cpp:139
[インライン化] FObjectSubsystemCollection::ForEachSubsystem(TFunctionRef<…>, const TSubclassOf<…> &) SubsystemCollection.h:230
ULocalPlayer::ReceivedPlayerController(APlayerController *) LocalPlayer.cpp:737
UCheatManager::EnableDebugCamera() CheatManager.cpp:678
UFunction::Invoke(UObject *, FFrame &, void *const) Class.cpp:7460
[ブループリント] CheatManager: ToggleDebugCamera Function /Script/Engine.CheatManager:ToggleDebugCamera
UObject::ProcessEvent(UFunction *, void *) ScriptCore.cpp:2209
UObject::CallFunctionByNameWithArguments(const wchar_t *, FOutputDevice &, UObject *, bool) ScriptCore.cpp:1494
[インライン化] UObject::ProcessConsoleExec(const wchar_t *, FOutputDevice &, UObject *) Object.h:1520
UCheatManager::ProcessConsoleExec(const wchar_t *, FOutputDevice &, UObject *) CheatManager.cpp:145
UPlayer::Exec(UWorld *, const wchar_t *, FOutputDevice &) Player.cpp:146
ULocalPlayer::Exec(UWorld *, const wchar_t *, FOutputDevice &) LocalPlayer.cpp:1536
UPlayerInput::ExecInputCommands(UWorld *, const wchar_t *, FOutputDevice &) PlayerInput.cpp:2351
UPlayerInput::InputKey(const FInputKeyEventArgs &) PlayerInput.cpp:456
UEnhancedPlayerInput::InputKey(const FInputKeyEventArgs &) EnhancedPlayerInput.cpp:244
APlayerController::InputKey(const FInputKeyEventArgs &) PlayerController.cpp:2397
UGameViewportClient::InputKey(const FInputKeyEventArgs &) GameViewportClient.cpp:770
UCommonGameViewportClient::InputKey(const FInputKeyEventArgs &) CommonGameViewportClient.cpp:60
FSceneViewport::OnKeyDown(const FGeometry &, const FKeyEvent &) SceneViewport.cpp:1088
SViewport::OnKeyDown(const FGeometry &, const FKeyEvent &) SViewport.cpp:288
[インライン化] FSlateApplication::ProcessKeyDownEvent::__l22::<lambda_2>::operator()(const FArrangedWidget &, const FKeyEvent &) SlateApplication.cpp:4850
FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,`FSlateApplication::ProcessKeyDownEvent’::`22’::<lambda_2> >(FSlateApplication *,FBubblePolicy,FKeyEvent,const <lambda_2> &,ESlateDebuggingInputEvent) SlateApplication.cpp:462
[インライン化] FEventRouter::RouteAlongFocusPath(FSlateApplication *, FBubblePolicy, FKeyEvent, const <lambda_2> &, ESlateDebuggingInputEvent) SlateApplication.cpp:431
FSlateApplication::ProcessKeyDownEvent(const FKeyEvent &) SlateApplication.cpp:4846
FSlateApplication::OnKeyDown(const int, const unsigned int, const bool) SlateApplication.cpp:4757
FWindowsApplication::ProcessDeferredMessage(const FDeferredWindowsMessage &) WindowsApplication.cpp:2900
FWindowsApplication::DeferMessage(TSharedPtr<…> &, HWND__ *, unsigned int, unsigned long long, long long, int, int, unsigned int) WindowsApplication.cpp:3587
FWindowsApplication::ProcessMessage(HWND__ *, unsigned int, unsigned long long, long long) WindowsApplication.cpp:2742
[インライン化] WindowsApplication_WndProc(HWND__ *, unsigned int, unsigned long long, long long) WindowsApplication.cpp:1720
FWindowsApplication::AppWndProc(HWND__ *, unsigned int, unsigned long long, long long) WindowsApplication.cpp:1725
[インライン化] WinPumpMessages() WindowsPlatformApplicationMisc.cpp:116
FWindowsPlatformApplicationMisc::PumpMessages(bool) WindowsPlatformApplicationMisc.cpp:145
FEngineLoop::Tick() LaunchEngineLoop.cpp:5548
[インライン化] EngineTick() Launch.cpp:60
GuardedMain(const wchar_t *) Launch.cpp:189
LaunchWindowsStartup(HINSTANCE__ *, HINSTANCE__ *, char *, int, const wchar_t *) LaunchWindows.cpp:271
WinMain(HINSTANCE__ *, HINSTANCE__ *, char *, int) LaunchWindows.cpp:339
４．PlayerControllerChanged内のコードになります
XXX.cpp(367)
void XXXX::PlayerControllerChanged(APlayerController* NewPlayerController)
{
Super::PlayerControllerChanged(NewPlayerController);
ULocalPlayer* localPlayer = GetLocalPlayerChecked();
if (!localPlayer || !InputMappingSwitcher) { return; }
if (UEnhancedInputLocalPlayerSubsystem* InputSubsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(localPlayer))
{
InputSubsystem->ClearAllMappings();
if (UEnhancedInputUserSettings* settings = GetValid(InputSubsystem->GetUserSettings()))
{
// Engine内の、FString UEnhancedInputUserSettings::GetSaveFilename(const ULocalPlayer* LP) が実行されるのだが、前述のメソッド内でアサーションが発生する場合があるので、実行をブロックする。
//
// if (IsValid(localPlayer->GetSubsystem<UEnhancedInputLocalPlayerSubsystem>())
// && IsValid(localPlayer->GetSubsystem<UEnhancedInputLocalPlayerSubsystem>()->GetPlayerInput()))
// {
settings->LoadOrCreateSettings(localPlayer);
// }
}
}