Unreal Engine Issues
Unreal Engine Issues
Changing MaterialQualityLevel causes a crash due to a ShaderMap mismatch in UniformExpressionCache
UE - Rendering - Architecture - Materials - Nov 26, 2025A crash may occur when changing the MaterialQualitylevel via Scalability due to a race condition. The issue occurs because in ScalabilityCVarsSinkCallback(), when it creates the FGlobalComponentRec ...
[AI] Unable to bind to parameter properties when using a Soft Object Reference
UE - AI - StateTree - Nov 21, 2025Global parameters disappear from the binding list when a soft object reference is present. Pulling up the binding menu shows nothing for Parameters when there are only object references in the ST as ...
same PhysicsAsset refresh multi times when modify multi SkeletalBodySetup properties in same PhysAsset
UE - Runtime - Character - Nov 20, 2025USkeletalBodySetup::PostEditChangeProperty will call OwningPhysAsset->RefreshPhysicsAssetChange(), if I modify many SkeletalBodySetup properties in same PhysAsset, will cause call OwningPhysAsset-> ...
Geometry Collections built with "Use Root Proxies" rendering/transform positions ignore the original root node rotation and can lead to unexpected behaviors
UE - Runtime - Deformable - Nov 17, 2025Geometry Collections (GC) built with "Use Root Proxies" rendering/transform positions ignore the original root node rotation and can lead to unexpected behaviors. If the root node of the GC was rot ...
Missing UV Clamping or Clear in SunAlphaPS_Mobile
UE - Platform - Mobile - Graphics - Nov 13, 2025In: void SunAlphaPS_Mobile( float2 InUVs[8] : TEXCOORD0, in FStereoPSInput StereoInput, out HALF_TYPE OutColor : SV_Target0 ) { OutColor = SunUnBias(SunShaftAndDofTexture.Sample(SunShaftAndDo ...
Mutable bake instance overwrite instead increments
UE - Anim - Mutable - Nov 13, 2025We are using Mutable and right now we can't overwrite already baked SK instances. This occurs when, we have a set variation for a character and we address a feedback on one of the used skeletal mesh ...
Build crash when enabling r.CreateShadersOnLoad=1
UE - Rendering - Architecture - Shaders - Nov 10, 2025When "r.CreateShadersOnLoad" is enabled, cooking will crash due to failure to create a shader. This occurs on //UE5/Release-5.5, CL: 41545209 and //UE5/Release-5.6, CL: 45232827 ...
5.6 Skeletal Meshes with Disabled Sections Flicker in Ray Tracing Scene
UE - Rendering - Graphics Features - Ray Tracing - Nov 7, 2025Skeletal meshes with disabled mesh sections will flicker in the Hardware Ray Tracing Scene. Also tested on //UE/Release-5.6, CL:45232827 ...
GAS: FActiveGameplayCueContainer::RemoveCue crash while iterating removals when consecutive Cue tags are conditionally added and the conditional effects removed in ascending order
UE - Gameplay - Gameplay Ability System - Nov 4, 2025When removing gameplay effects by tag, if the tag that is being removed has other tags that are dependent on it in a cyclical way an "array out of bounds ' error can be triggered. ...
[AI] Gaps between Nav Mesh tiles in World Partition map causing movement issues
UE - Runtime - Character - Nov 4, 2025Navmesh has seams between some tiles that are actual edges rather than previously found "gaps" where it was a debug rendering issue. Pathfinding does fail between these tiles to go straight across. ...