Light Function Materials containing a Texture Sample and Rotator nodes will fail RHI Validation

UE - Rendering - Architecture - RHI - Jan 12, 2026

Using a Light Function Material that contains a Texture Sample and Rotator nodes will cause RHI Validation to fail with the following error: LogOutputDevice: Error: Ensure condition failed: Bindings ...

"Scale for <ComponentName> has a component set to zero, which will result in a bad body instance" warning spam when moving actor instance even with Collision Profile overriden to "NoCollision"

UE - Simulation - Physics - Jan 12, 2026

When a StaticMeshComponent has a scale component of zero in WorldSpace (after accumulating with the hierarchy from the root to it), function UPrimitiveComponent::OnCreatePhysicsState() logs the warn ...

Lumen Global Distance Field Trace Leaking due to Surface Cache Sampling

UE - Rendering - Graphics Features - Jan 12, 2026

At specific distances from a thin wall, surfaces inside of a sealed chamber can receive indirect lighting from outside, leaking light into the chamber. This appears to be due to how SWRT handles sa ...

GameplayTags meta "Categories" return warning when all categories are not present inside the FGameplayTagContainer

UE - Gameplay - Jan 12, 2026

Categories are not processed correctly for gameplay tags when meta "Categories" is used. Categories filter which categories appear for the mentioned gameplay tag variable and with recent changes, it ...

Temporal blur artifacts on Geometry Cache Components in Blueprint actor

UE - Editor - Content Pipeline - Alembic - Jan 9, 2026

When a Geometry Collection is in a Blueprint, attached to other components, it can render incorrect motion vectors at some angles. In the test project, any angle that is not a multiple of 45 will re ...

Not possible to force the Skeleton attribute to None on a default asset pipeline preset

UE - Editor - Content Pipeline - Import and Export - Jan 9, 2026

I guess that when the default value of the pipeline is None, the editor will silently pick the skeleton that is in the same folder of where you are importing. If the UI is active you can then force ...

Velocity Scene Texture Data Integrity Issues

UE - Graphics Features - Jan 8, 2026

When a Post-Process Material uses the Scene Texture Material Expression, the following code is generated: ``` MaterialFloat2 Local0 = Parameters.TexCoords[0].xy; MaterialFloat2 Local1 = ClampSceneT ...

Inconsistent Behavior in TextureLODGroups when setting NumStreamedMips=0

UE - Rendering - Architecture - Jan 8, 2026

A licensee has reported that it is not possible to disable texture streaming of a given TextureLODGroup by setting "NumStreamedMips=0" in their device profiles. Currently, using 0 results in the sam ...

OverrideVertexColor causes a crash on mobile renderer

UE - Platform - Mobile - Jan 8, 2026

Setting Allow CPU Access on the mesh, or setting bSupportsManualVertexFetch=1 in Engine.ini, avoids the crash. ...

Global Weight of Slot Node is incorrect when fetched after using a Pose Cache

UE - Anim - Runtime - Anim Blueprints - Jan 7, 2026

When a montage slot node output is pushed to a Pose Cache and used in a Two-Way Blend, the value returned by GetSlotNodeGlobalWeight will be the current fractional value rather than the actual globa ...