Deadlock when running an asset validator commandlet with async skeletalmesh build

UE - Editor - Open File Formats - Asset Migration - Mar 10, 2023

[External Code]   UnrealEditor-Core.dll!FEventWin::Wait(unsigned int WaitTime, const bool bIgnoreThreadIdleStats) Line 1515 C++   UnrealEditor-Engine.dll!FAsyncTaskBase::WaitCompletionWithTimeout( ...

Game mode Login event called before GameMode BeginPlay

UE - Networking - Feb 23, 2016

Code / blueprint script for game mode login functions executes before the game mode begin play function. ...

Crash when calling capture mouse as the return value in an OnKeyDown

UE - Editor - UI Systems - Sep 25, 2017

The editor crashes when calling an over ridden On Key down function in a widget in order to capture the mouse with the return value of the function. ...

Using FObjectFinder outside of the constructor causes crash

UE - Foundation - Core - May 19, 2015

If FObjectFinder is used in a function other than the constructor, which should not be done, it causes a crash. ...

GameplayAbility Blueprint's FGameplayAttribute does not retain value reference upon Compile

UE - Gameplay - Sep 17, 2019

GameplayAttribute-type function arguments in BP-callable functions(I.E a Blueprint event graph) or nodes have their value reset on BP compilation ...

FAnimMontageInstance needs more API exposure

OLD - Anim - Feb 3, 2016

Users are unable to call most functions on this class (FAnimMontageInstance ), as ENGINE_API is only added to a handful of functions. Other structs in AnimMontage.h may need similar exposure. ...

FFileManagerGeneric::Move has unused parameter

UE - Foundation - Core - Dec 28, 2016

The bool Replace parameter variable is necessary when calling the function, but is not used inside the function itself. This makes the variable seem useless / unnecessary in the parameter list. ...

When rendering a reflection capture, the lightmap may be rendered without finishing streaming.

UE - Rendering - Features - Oct 5, 2021

This problem occurs when you do a lighting build. It does not occur when the reflection capture is done by itself. ...

The HISM will have double drawcalls when player opens r.Mobile.AllowDitheredLODTransition

UE - World Creation - Worldbuilding Tools - Foliage - Nov 2, 2020

Please check the Function GetDynamicMeshElements in HierarchicalInstancedStaticMesh.cpp. The  Function Traverse in GetDynamicMeshElements will always return two Lod levels, even the transition is f ...

Puzzle template blocks turn gray when hovered over in Code version vs no reaction in BP version

Docs - Samples - Feb 3, 2017

Functionality is different between code and bp versions of the puzzle template ...