Unreal Engine Issues
Unreal Engine Issues
In a Geometry Collection, enabling Nanite Fallback in a Nanite Enabled collection won't generate a Physics Body when Nanite is disabled
UE - Simulation - Visual - Jun 30, 2025In a Geometry Collection, enabling Nanite Fallback in a Nanite Enabled collection won't generate a Physics Body when Nanite is disabled. To verify this, follow the steps provided in the Steps to Re ...
PCG crash when using Attribute Remove Duplicates on partitioned data if one of those sets of data is empty
UE - World Creation - Procedural Tools - PCG Graph - Jul 3, 2025Context: In PCG, the Attribute Remove Duplicates node can be used to remove duplicate attributes from an array. Problem: The licensee has observed that using the Attribute Remove Duplicates node ...
Crash when spawning an actor with an AtmosphericFogComponent in a packaged build
UE - Graphics Features - Aug 25, 2020Spawning an actor that contains an AtmosphericFogComponent results in a crash in a packaged build. It doesn't occur in PIE, or StandAlone. ...
Ensure occurs while duplicating world partitioned level by WorldPartitionRenameDuplicateBuilder commandlet
UE - World Creation - Worldbuilding Tools - World Partition - Aug 21, 2023The level seems to have been successfully copied. ...
NiagaraSystem with EniagaraGpuComputeTickStage::PostInitViews rarely crashes due to multi-thread race conflicts
UE - Niagara - Mar 1, 2025NiagaraSystem with EEiagaraGpuComputeTickStage::PostInitViews should not have bSupportsParallelGDME because of possible multi-threaded contention, but FNiagaraSystemInstanceController::GetGpuCompute ...
Crash when searching for a string with the same name as the collection
UE - Editor - Feb 28, 2025The editor crashes when creating a local collection of the same name by typing certain characters in the search box of the content browser. This does not reproduce in UE5.4 and is a regression in UE ...
Crash can occur when loading a sub level that contains an actor with a child actor component
UE - Gameplay - Dec 1, 2017A licensee is reporting a crash where loading a sublevel that contains an actor with a child actor component can cause a crash. After speaking to Marc Audy, this seems to be related to the initializ ...
FAnimationRuntime::BlendPosesPerBoneFilter() causes an assertive crash when Skeletal Mesh LOD is changed
UE - Anim - Runtime - Nov 1, 2023The crash occurs from "check(BoneBlendWeights.Num() == NumBones);" This crash occurs when the following conditions are met;The skeletal mesh LOD is changed.The number of bones is difference between ...
Destroying a welded actor is causing an Array index out of bounds crash on 5.6
UE - Simulation - Core - Jul 30, 2025Destroying a welded actor is causing an Array index out of bounds crash on 5.6. The licensee has provided a repro project that reliably causes a crash whenever the spawned actor is destroyed. There ...
Crash when switching from Lumen visualization to raytracing visualization
UE - Rendering - Graphics Features - Mar 27, 2026When switching from Lumen visualization to raytracing visualization via the console, the editor can crash to desktop. The crash appears to happen deep within the driver libraries, and does not trig ...