Creating FTickableObjectBase inherited class in async thread may cause pure virtual function call

Classes that inherit from FTickableObjectBase are added to the tickable queue by the QueueTickableObjectForAdd function during their construction (see FTickableGameObject::FTickableGameObject).
At this point, however, the vtable of the derived class has not been set yet, so processing tickables on the game thread immediately may result in a crash.

1. download and build the repro project in EPS case linked in this ticket
   Note : The project has a deliberate Sleep call to ensure reproduction
2. Start PIE

Result:

Pure virtual function call occurs and crashes (see callstack)

[Inline Frame] UnrealEditor-Core.dll!PureCallHandler::__l2::<lambda>() Line 753 C++
UnrealEditor-Core.dll!PureCallHandler() Line 753 C++
vcruntime140.dll!00007ffdb28659e4() Unknown
UnrealEditor-Engine.dll!FTickableGameObject::TickObjects(UWorld * World, ELevelTick LevelTickType, bool bIsPaused, float DeltaSeconds) Line 195 C++
UnrealEditor-UnrealEd.dll!UEditorEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 2203 C++
UnrealEditor-UnrealEd.dll!UUnrealEdEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 533 C++
UnrealEditor.exe!FEngineLoop::Tick() Line 5622 C++
[Inline Frame] UnrealEditor.exe!EngineTick() Line 60 C++
UnrealEditor.exe!GuardedMain(const wchar_t * CmdLine) Line 187 C++
UnrealEditor.exe!LaunchWindowsStartup(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow, const wchar_t * CmdLine) Line 271 C++
UnrealEditor.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * pCmdLine, int nCmdShow) Line 339 C++
[Inline Frame] UnrealEditor.exe!invoke_main() Line 102 C++
UnrealEditor.exe!__scrt_common_main_seh() Line 288 C++
kernel32.dll!00007ffdbf647374() Unknown
ntdll.dll!00007ffdc0bdcc91() Unknown