Unreal Engine Issues
Unreal Engine Issues
Crash caused by a race condition in Nanite::DispatchBasePass()
UE - Rendering - Graphics Features - Nanite - Feb 25, 2026Nanite::BuildShadingCommands() launches two asynchronous tasks: ShadingCommands.SetupTask ShadingCommands.BuildCommandsTask BuildCommandsTask is responsible for modifying ShadingCommands.Commands ...
Cluster Group Index Causes Incorrect Break Events in Geometry Collections
UE - Runtime - Deformable - Feb 25, 2026More details in this [Link Removed] ...
Occlusion Queries for Static Meshes with ERuntimeVirtualTextureMainPassType::Exclusive
UE - Rendering - Architecture - Feb 20, 2026Static Meshes that draw into RVTs and have "Draw In Main Pass" is set to "From Virtual Texture" (ERuntimeVirtualTextureMainPassType::Exclusive) will still draw in Occlusion Queries. This can be tr ...
Precaching global shaders with r.PSOPrecache.GlobalShaders = 2 crashes on startup
UE - Rendering - Architecture - RHI - Feb 19, 2026A licensee has reported that they are trying to run a cooked project with r.PSOPrecache.GlobalShaders=2 and running into a crash. They believe the problem is in PrecacheComputePipelineStatesForGlob ...
Bug - Vertex Interpolator exposing parameters to instance even if its not connected
UE - Rendering - Architecture - Materials - Feb 17, 2026Parameters attached to the input of a Vertex Interpolator Material Expression are visible in the Material Instance, even if the output of the Vertex Interpolator Material Expression is not connected ...
Distance Field Shadows do not work with Nanite meshes
UE - Rendering - Graphics Features - Nanite - Feb 16, 2026Nanite meshes only cast virtual shadow maps and do not cast any distance field shadows, regardless of the distance of the shadow casting mesh to the camera. ...
Material Parameter Collection Track doesn't work in UMG Preview from 5.7
UE - Editor - UI Systems - UMG - Feb 12, 2026The UMG editor allows us to add a Material Parameter Control track to an animation. This track makes it possible to animate parameters used in a material. Designers can scrub the timeline and previe ...
Animation compression deadlock
UE - Runtime - Anim BP - Feb 5, 2026The deadlock occurs when attempting to cancel compression during animation sequence destruction. The compression thread ends up deadlocking with the game thread, which is the one requesting the canc ...
Ending a GameplayAbility from an AbilityTask created by the same GameplayAbility does not correctly end the AbilityTask, and it continues ticking.
UE - Gameplay - Gameplay Ability System - Feb 2, 2026When a GameplayAbility is ended from within a child AbilityTask, the AbilityTask is not cleaned up correctly. As a result, even though the GameplayAbility is no longer active, the AbilityTask contin ...
Crash when enabling Nanite on a Mesh using an OptimusDeformer
UE - Anim - Rigging - Deformer - Jan 29, 2026When a skeletal mesh has a deformer present and then nanite support is enabled and applied. (the deformer in question was hsasset://DeformerGraph/Deformers/DG_LinearBlendSkin_Morph_Cloth_RecomputeNo ...