If there is a C# defined class which has a name ending in "Actor" and inherits from AActor there will be warnings on overridden functions (e.g. ReceiveBeginPlay) when opening a Blueprint editor.
This also happens in C++ if you were to create a class UMyActor : UObject and add an exposed function called ReceiveBeginPlay. There would be a warning that there is an ambiguous function conflicting with AActor even though UMyActor has nothing to do with AActor or its ReceiveBeginPlay function.
UE4Editor-CoreUObject.dll!StaticFindObjectFastInternalThreadSafe(FUObjectHashTables & ThreadHash, UClass * ObjectClass, UObject * ObjectPackage, FName ObjectName, bool bExactClass, bool bAnyPackage, EObjectFlags ExcludeFlags, EInternalObjectFlags ExclusiveInternalFlags) Line 517 C++
UE4Editor-CoreUObject.dll!StaticFindObjectFastInternal(UClass * ObjectClass, UObject * ObjectPackage, FName ObjectName, bool bExactClass, bool bAnyPackage, EObjectFlags ExcludeFlags, EInternalObjectFlags ExclusiveInternalFlags) Line 542 C++
UE4Editor-CoreUObject.dll!StaticFindObjectFast(UClass * ObjectClass, UObject * ObjectPackage, FName ObjectName, bool ExactClass, bool AnyPackage, EObjectFlags ExclusiveFlags, EInternalObjectFlags ExclusiveInternalFlags) Line 288 C++
UE4Editor-CoreUObject.dll!StaticFindObject(UClass * ObjectClass, UObject * InObjectPackage, const wchar_t * OrigInName, bool ExactClass) Line 365 C++
UE4Editor-Kismet.dll!FBlueprintSpawnNodeCommands::RegisterCommands() Line 328 C++
UE4Editor-Kismet.dll!TCommands<FBlueprintSpawnNodeCommands>::Register() Line 57 C++
UE4Editor-Kismet.dll!FBlueprintEditor::CreateDefaultCommands() Line 2375 C++
UE4Editor-Kismet.dll!FBlueprintEditor::CommonInitialization(const TArray<UBlueprint *,FDefaultAllocator> & InitBlueprints) Line 1650 C++
UE4Editor-Kismet.dll!FBlueprintEditor::InitBlueprintEditor(const EToolkitMode::Type Mode, const TSharedPtr<IToolkitHost,0> & InitToolkitHost, const TArray<UBlueprint *,FDefaultAllocator> & InBlueprints, bool bShouldOpenInDefaultsMode) Line 1768 C++
UE4Editor-Kismet.dll!FBlueprintEditorModule::CreateBlueprintEditor(const EToolkitMode::Type Mode, const TSharedPtr<IToolkitHost,0> & InitToolkitHost, UBlueprint * Blueprint, bool bShouldOpenInDefaultsMode) Line 257 C++
UE4Editor-AssetTools.dll!FAssetTypeActions_Blueprint::OpenAssetEditor(const TArray<UObject *,FDefaultAllocator> & InObjects, TSharedPtr<IToolkitHost,0> EditWithinLevelEditor) Line 87 C++
UE4Editor-UnrealEd.dll!FAssetEditorManager::OpenEditorForAsset(UObject * Asset, const EToolkitMode::Type ToolkitMode, TSharedPtr<IToolkitHost,0> OpenedFromLevelEditor, const bool bShowProgressWindow) Line 378 C++
UE4Editor-AssetTools.dll!FAssetTypeActions_Base::AssetsActivated(const TArray<UObject *,FDefaultAllocator> & InObjects, EAssetTypeActivationMethod::Type ActivationType) Line 57 C++
UE4Editor-ContentBrowser.dll!SContentBrowser::OnAssetsActivated(const TArray<FAssetData,FDefaultAllocator> & ActivatedAssets, EAssetTypeActivationMethod::Type ActivationMethod) Line 2085 C++
UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,void __cdecl(TArray<FAssetData,FDefaultAllocator> const & __ptr64,enum EAssetTypeActivationMethod::Type)>::ExecuteIfSafe(const TArray<FAssetData,FDefaultAllocator> & <Params_0>, EAssetTypeActivationMethod::Type <Params_1>) Line 345 C++
UE4Editor-ContentBrowser.dll!SAssetView::OnListMouseButtonDoubleClick(TSharedPtr<FAssetViewItem,0> AssetItem) Line 4046 C++
UE4Editor-ContentBrowser.dll!TBaseSPMethodDelegateInstance<0,SAssetView,0,void __cdecl(TSharedPtr<FAssetViewItem,0>)>::ExecuteIfSafe(TSharedPtr<FAssetViewItem,0> <Params_0>) Line 345 C++
UE4Editor-ContentBrowser.dll!TBaseDelegate<void,TSharedPtr<FAssetViewItem,0> >::ExecuteIfBound(TSharedPtr<FAssetViewItem,0> <Params_0>) Line 624 C++
UE4Editor-ContentBrowser.dll!SListView<TSharedPtr<FAssetViewItem,0> >::Private_OnItemDoubleClicked(TSharedPtr<FAssetViewItem,0> TheItem) Line 815 C++
UE4Editor-ContentBrowser.dll!STableRow<TSharedPtr<FAssetViewItem,0> >::OnMouseButtonDoubleClick(const FGeometry & InMyGeometry, const FPointerEvent & InMouseEvent) Line 310 C++
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_eeb33fd1b480e3cad58a1531d90d2e14> >(FSlateApplication * ThisApplication, FEventRouter::FBubblePolicy RoutingPolicy, FPointerEvent EventCopy, const FSlateApplication::RoutePointerDoubleClickEvent::__l2::<lambda_eeb33fd1b480e3cad58a1531d90d2e14> & Lambda) Line 268 C++
UE4Editor-Slate.dll!FSlateApplication::RoutePointerDoubleClickEvent(FWidgetPath & WidgetsUnderPointer, FPointerEvent & PointerEvent) Line 5922 C++
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonDoubleClickEvent(const TSharedPtr<FGenericWindow,0> & PlatformWindow, FPointerEvent & InMouseEvent) Line 5909 C++
UE4Editor-Slate.dll!FSlateApplication::OnMouseDoubleClick(const TSharedPtr<FGenericWindow,0> & PlatformWindow, const EMouseButtons::Type Button, const FVector2D CursorPos) Line 5885 C++
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage(const FDeferredWindowsMessage & DeferredMessage) Line 1740 C++
UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage(TSharedPtr<FWindowsWindow,0> & NativeWindow, HWND__ * InHWnd, unsigned int InMessage, unsigned __int64 InWParam, __int64 InLParam, int MouseX, int MouseY, unsigned int RawInputFlags) Line 2182 C++
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage(HWND__ * hwnd, unsigned int msg, unsigned __int64 wParam, __int64 lParam) Line 895 C++
UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc(HWND__ * hwnd, unsigned int msg, unsigned __int64 wParam, __int64 lParam) Line 732 C++
user32.dll!0000000077249bbd() Unknown
user32.dll!00000000772498c2() Unknown
UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages(bool bFromMainLoop) Line 129 C++
UE4Editor.exe!FEngineLoop::Tick() Line 3417 C++
UE4Editor.exe!GuardedMain(const wchar_t * CmdLine, HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, int nCmdShow) Line 166 C++
UE4Editor.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow) Line 209 C++
UE4Editor.exe!__scrt_common_main_seh() Line 283 C++
kernel32.dll!00000000771259cd() Unknown
ntdll.dll!000000007738385d() Unknown