Unreal Engine Issues
Unreal Engine Issues
[StateTree] StateTree fails to transition to the next state in child states when parent state contains some tasks
UE - AI - StateTree - Jun 12, 2026StateTree fails to transition to the next child state in a tree where the parent state has a task such as Debug Text which does not influence state completion. The ST atttempts to transition from Le ...
World Bookmark can't be saved when a Private Data Layer is "collected" by the UDataLayerEditorState
UE - World Creation - Worldbuilding Tools - Data Layers - Jun 9, 2026The World Bookmark system cannot properly handle Private Data Layer. The current state can make them unusable since the Bookmark might not be saveable. ...
Niagara NDC GPU Instance Counter leak
UE - Niagara - Jun 5, 2026In NiagaraDataChannelData.cpp, FNiagaraDataChannelDataProxy::EndFrame enqueues a GPU readback for each entry in PendingGPUReadbackBuffers, but the corresponding FNiagaraGPUInstanceCountManager::Free ...
Instanced Actors: Editor preview don't show correct relative mesh transforms
UE - Engine Scaling - Mass - May 30, 2026Context Actors can be converted into Instanced Actors via the IA plugin. During runtime and in the editor, an instanced actor’s visual is generated from the collection of StaticMeshComponents on th ...
Assert crash when playing Groom Cache with Card Mesh LOD
UE - Rendering - Graphics Features - May 29, 2026Playing a Guides Groom Cache while Card Mesh LOD (Guide-Based) is active causes an assert in RunHairStrandsInterpolation_Cards when the renderer switches to Card LOD. Assert location:Plugins/Runtim ...
Niagara Mesh Renderer registers NumParticles x NumMeshVariants TLAS instances
UE - Rendering - Graphics Features - Ray Tracing - May 28, 2026When using the Niagara Mesh Renderer with multiple mesh variants selected via MeshIndex, the number of TLAS instances allocated is NumParticles × NumMeshVariants and enabling the Path Tracer can ca ...
PrepareTextureResources is being called repeatedly (on commandlets and potentially other cases)
UE - Graphics Tools - Terrain - Landscape - May 28, 2026Implement a commandlet that renders (with `-AllowCommandletRendering`) and frequently calls `CommandletHelpers::TickEngine()`.Have the commandlet load a map containing a world-partitioned landscape. T ...
Blocky artifacts in right eye when reflection captures are used
UE - Platform - XR - May 27, 2026VSM + Nanite Tessellation + Volumetric Fog Shadow leaking while the Directional lighting is rotating
UE - Rendering - Graphics Features - May 25, 2026Functions referenced via a Property Access node don't appear in blueprint Find By Class Member results
UE - Runtime - Anim BP - May 22, 2026Finding Reference By Class Member fails to find references to bp functions from property access nodes. ...