Unreal Engine Issues and Bug Tracker

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Latest Bugs

Virtual Memory leak when using specific rendering settings in the template project

UE - Rendering Architecture

When a project is run with these settings in a template project, untracked virtual memory increases. Cvars r.GBufferFormat 3 r.Lumen.TraceMe...

Skeletal Mesh BLAS updates when not animating

UE - Graphics Features - Ray Tracing

The BLAS for Skeletal Meshes that don't move, or tick get updated every frame even if the animation and skin cache aren't updated. This adds o...

When r.SSR.Stencil is enabled, there is wrong logic observed.

UE - Graphics Features

When r.SSR.Stencil is enabled, the areas with high roughnesss are not discarded and Unlit materials are incorrectly handled. See the linked ...

Crash during .zfprj import when Feature detection quality is set to High and Use mosaic images as feature source is set to Yes

Found in 2.0.0.118621 (R200). It appears that the combination of Feature detection - High and Use mosaic images as feature source during .z...

Subobject ComponentClass overrides cause failing assertions due to UObject reconstruction on AsyncLoadingThread

UE - Framework - Blueprint

Context The blueprint editor allows you to override an actor component's class in derived blueprints (component details panel -> Component Cl...

Latest Fixes

Automated tests DynamicSubobjectInstancing and NonNativeInstancedSubobjects (CoreUObject group) fail

The DynamicSubobjectInstancing and NonNativeInstancedSubobjects automation tests fail....

Wrong motion vectors with Nanite ISM when using ActorPosition material node

UE - Graphics Features

Here is the file for the repro project in Google Docs, due to the file size limit: [Link Removed]...

Outliner eye toggle fails to hide static meshes when Affect Indirect Lighting While Hidden is enabled

UE - Rendering Architecture

When a static mesh has the property Affect Indirect Lighting While Hidden enabled, toggling its visibility via the Outliner eye icon does not ...

Video material broken on Mac M3+ (sm6)

On Mac devices, the video material in the viewport will display incorrectly, appearing stretched significantly. This only seems to affect the ...

Crash when spawning actor with no viewport initialized

UE - Editor - Workflow Systems

If an attempt to spawn an actor is made before the Level Editor Viewport is fully initialized (i.e. before it has had a chance to get rendered...