Unreal Engine Issues
Unreal Engine Issues
Ensure fires during nativized build while packaging for any BP class based on UAnimNotify
OLD - Anim - Oct 25, 2018Cooking will fail while attempting to convert a non-data-only Blueprint class based on the native UAnimNotify class when Blueprint nativization is enabled. Workaround in lieu of a fix would be to e ...
Null FPhysicsActorHandle dereference in FBodyInstance::InitDynamicProperties_AssumesLocked when CreateShapes_AssumesLocked fails during async body init
UE - Runtime - Simulation - Aug 2, 2026Summary When CreateShapes_AssumesLocked fails during async body creation, the failed FBodyInstance is left in Bodies[] with a released actor handle. InitDynamicProperties_AssumesLocked is then called ...
[Niagara][5.8] Data Channel Read and Write register with an identical type hash when fx.Niagara.DataChannels.Enabled is set from ini, hitting checkf in FNiagaraTypeRegistry::RegisterTypeInternal
UE - Rendering - Architecture - Niagara - Sep 28, 2026Affects: 5.8 (verified on Release-5.8), Windows, EditorSummary Adding fx.Niagara.DataChannels.Enabled=true to an ini file makes the Niagara editor assert when a Data Channel Read is created. The sa ...
When PCH is Disabled, Error Occurs in VulkanGenericPlatform.h at Android Build
UE - Graphics Features - Dec 6, 2018If disable PCH in Target.cs, an error will occur when building for Android. The log is as follows. LogPlayLevel: Error: D:/Build/Release-4_21_0/Engine/Source/Runtime/VulkanRHI/Private/Android/../Vu ...
Shader Compiler Crashes in Remote Build
UE - Graphics Features - Nov 11, 2019Output log when crashing UATHelper: Packaging (iOS): LogCook: Display: Max memory allowance for cook 16384mb min free memory 0mb UATHelper: Packaging (iOS): LogCook: Display: Mobile HDR setting 1 ...
"Landscape Layer" Doesn't appear in LandscapeMode even when the landscape is assigned a Layer-Based Material
UE - Graphics Tools - Terrain - Aug 19, 2026POST LINK: https://forums.unrealengine.com/t/bug-ue5-8-1-landscape-layer-doesnt-appear-in-landscapemode-even-when-the-landscape-is-assigned-a-layer-based-material/2745109 POST BODY:Summary[Bug][UE5 ...
Distributed HLOD builds always fail for projects not under the Engine Root
UE - Engine Scaling - Streaming - HLOD - Dec 4, 2024In BuildProject.txt, to make relative path to the project outside the engine root, all paths contains “..” after action command directory. D:/dev/UnrealEngine-5.5.0//HLODTemp/f09bf0f5/HLODBuilder0 ...
Crash when attempting to change the parent of a material instance constant through editor scripting
UE - Rendering - Architecture - Materials - Apr 9, 2025The built-in class "UMaterialEditingLibrary" provides various editor scripting functions related to creating and editing materials and material instances. One of these functions, UMaterialEditingLib ...
Implemented Interfaces are not added to nativization list
UE - Gameplay - Blueprint Runtime - Jan 25, 2017Implemented interfaces are not added to the list of assets to nativize when the blueprint class that implements them is flagged for nativization, saved, and compiled. This results in a package failu ...
ComponentOverlapMultiByChannel with a rotated simple collision PrimComp misses overlap vs. complex collision
UE - Runtime - Simulation - Nov 8, 2023UWorld::ComponentOverlapMultiByChannel and internally, the call to FBodyInstance::OverlapMulti, misses overlaps and blocking hits when the PrimComp's (the component used to test overlaps) mesh uses ...