Unreal Engine Issues
Unreal Engine Issues
Sub-world partitions do not properly handle partial editor loading as world partition standalone level instances' spatially loaded actors do not get loaded even when the Level Instance is force loaded or loaded in by region.
UE - World Creation - Worldbuilding Tools - World Partition - Aug 19, 2025Context Level Instancing is a level-based workflow designed to improve and streamline the level editing experience. In a standalone Level Behavior, when the Level Instance Actor is loaded through it ...
Packaging fails with Event Driven loader enabled and two function libraries reference each other
UE - Foundation - Core - Mar 29, 2017Packaging fails with Event Driven loader enabled and two function libraries reference each other even though the functions referenced in each library to NOT call each other in such a way as to creat ...
[CrashReport][Assert] UnrealEditor-RHI!FRHIResource::MarkForDelete() [Engine/Source/Runtime/RHI/Private/RHIResources.cpp:49]
UE - Rendering - Architecture - Materials - Dec 18, 2024One of the users described this issue as below. "At seemingly random times while working in the material graph, some action will cause a hitch or freeze, and quickly after the engine will crash, an ...
Velocity Scene Texture Data Integrity Issues
UE - Graphics Features - Jan 8, 2026When a Post-Process Material uses the Scene Texture Material Expression, the following code is generated: ``` MaterialFloat2 Local0 = Parameters.TexCoords[0].xy; MaterialFloat2 Local1 = ClampSceneT ...
IAP failed to read purchase
UE - Platform - Mobile - Feb 20, 2017In-app purchases do not seem to be working properly in Unreal Match 3 or other games ...
Soft angular constraints solve velocity like hard constraints
UE - Runtime - Simulation - Jul 17, 2025Soft angular constraints are solving velocity like hard constraints. Instead of swinging back and forth, the affected body just snaps to 45 degrees. Check the steps to reproduce for more details. Th ...
Lyra animation stutter when character moves from side to side
UE - Content - Sample - Nov 21, 2022When moving in Lyra side to side using the B_Hero_ShooterMannequin as the player character, the animation will noticeably stutter whenever you change the direction of the movement. I repro'd this 3/ ...
Transform variable values in a Control Rig cannot be copied or pasted onto
UE - CAPT - Control Rig - Nov 29, 2022When trying to copy/paste values from anything to a Transform variable's values, it will not happen. Additionally, you cannot copy/paste anything from a Transform variable. I repro'd this 3/3 times. ...
PATH not passed to NMake script when building Android from Visual Studio
UE - Core - Cpp Tools - UnrealBuildTool - Jan 25, 2023After upgrading from UE5.0.3 to UE5.1, we started seeing this error when trying to build Android Development from Visual Studio (VS2022 17.2.1): Running UnrealBuildTool: dotnet "..\..\Engine\Binari ...
Crash when a StateTree-related Parameter is of a type that includes two nested arrays with the same name (due to FPropertyChangedEvent::ArrayIndicesPerObject using array names to map to their changed indices)
UE - Framework - Dec 19, 2025This issue was reported in the context of adding and setting parameters on StateTrees, Tasks and related assets, but its root cause lies in the structure FPropertyChangedEvent and can possibly affec ...