Unreal Engine Issues
Unreal Engine Issues
Hot reloading newly created C++ project compiles modules
UE - Foundation - Core - Apr 25, 2017This is a regression from 4.15.2 and occurs on both Windows and Mac. Affects both Binary and Github builds. ...
Ensure undoing pin split - Found K2Node_CallFunction_429 ('K2Node_CallFunction') that does not belong to EventGraph.
UE - Gameplay - Blueprint Editor - Sep 15, 2017REGRESSION: Yes, does not occur in 4.17.2 Ensure occurs when undoing the splitting of a pin. ...
Some Niagara Fluid systems are not visible in a packaged project
UE - Rendering - Architecture - Niagara - Jun 7, 2022Previously packaging caused a crash with this system. This was fixed, but now the system is no longer visible when packaged. ...
WorldPartition: Attached Actors within Level Instances save level offset bounds
UE - Engine Scaling - Streaming - Level Instances - May 9, 2023The proposed fix is implemented in CL 25389340 but needs further testing to make sure there are no issues caused by it. ...
WorldPartitionActorDescs for LevelInstanceActors are broken when migrating world partitioned level
UE - Engine Scaling - Streaming - Level Instances - Jun 13, 2023WorldPartionActorDescs will be restored to the correct properties when resaved. They can also be fixed by the WorldPartitionResaveActorsBuilder commandlet. ...
Result pin of Cast Node of ControlRig can not break
UE - ACT Character - Control Rig - Jul 26, 2023In UE5.1, the Result pin of the ControlRig cast node could be broken, but it cannot be broken from UE5.2. ...
CreatePatchLibrary is broken
UE - Rendering - Architecture - Shaders - Nov 12, 2025It seems the FEditorShaderCodeArchive.LoadExistingShaderCodeLibrary missed some functions, use FEditorShaderCodeArchive.AddShaderCodeLibraryFromDirectory instead could fix the issue. ...
Megalights support for anisotropic materials
UE - Rendering - Features - Lumen - Apr 14, 2026A licensee noticed that SUPPORTS_ANISOTROPIC_MATERIALS is not passed to FShadeLightSamplesCS::ModifyCompilationEnvironment for MegaLights ShadeLightSampleCS. Adding it fixes the issue. ...
Root component doesn't scale appropriately when defer spawning in C++
UE - Gameplay - Components - Feb 12, 2018Whenever defer spawning is used from the GameplayStatics library it is supposed change it's transform properties based on what is passed in as a parameter. Despite this, it seems the newly created a ...
Possessing and Unpossessing a Pawn when using NetCulling causes the Client to lock up
UE - Networking - Aug 1, 2019In this test bench, they are using a APawn with a custom replicated Movement Component rather than using a ACharacter and they are getting a different result that ends up in a permanent softlock of ...