Unreal Engine Issues
Unreal Engine Issues
DynamicMaterialParameters Niagara module resets write flags on emitter update
UE - Niagara - Feb 4, 2026When using the DynamicMaterialParameters Niagara module in UE 5.6, 5.7, and UE5-Main (CL 50298778), updating an emitter causes Boolean values, such as Index0Float0Write, to reset to default values, ...
Approximate HLOD: Default materials are not compatible and get rejected by FMaterialUtilities::IsValidFlattenMaterial when forcing their use
UE - World Creation - Worldbuilding Tools - HLOD - Feb 3, 2026The Approximated Mesh HLOD layer cannot use its default materials: FullMaterialBakeOutputMaterial_PackedMRS and FullMaterialBakeOutputMaterial. The Param2D names are incompatible and the materials ...
Mover | FStanceModifier adjustment teleport on Crouch/Uncrouch can fail when child components intersect world
UE - Gameplay - Player Movement - Mover - Feb 3, 2026Context When crouching and uncrouching with Mover’s DefaultMovementSet, the pawn capsule’s half height is changed. This behavior mimics the CharacterMovementComponent. To ensure the pawn’s feet sta ...
Mass entities initializing fragments on the incorrect archetypes due to shared CreationContext
UE - AI - Mass - Feb 3, 2026UMassAgentSubsystem::HandlePendingInitialization creates a single FEntityCreationContext that is reused across all iterations of the PendingAgentEntities loop. When SpawnEntities eventually calls in ...
Tooltips not appearing in Editor when hovering over assets due to Slate Cursor Move settings
UE - Editor - UI Systems - Slate - Feb 3, 2026User noticed that when Slate.EnableSyntheticCursorMoves is set to false the editor UI tooltips no longer display. As noted by the user, modifying Slate.CursorSignificantMoveDetectionThreshold to at ...
SimpleStreamableAssetManager: Memory Bloat/Leak in AssetIndexToBounds4Index
UE - World Creation - Worldbuilding Tools - Feb 3, 2026Overview: A report has been received regarding a memory leak that eventually leads to OOM crashes when s.StreamableAssets.UseSimpleStreamableAssetManager=1 is enabled. In projects that utilize this ...
Material Functions are incorrectly listed in the Layer Asset list
UE - Rendering - Architecture - Materials - Feb 3, 2026Since UE 5.7, Material Functions are included in the Layer Asset list of the Material Layers of an instanced material using material layers. It is also possible to drag and drop Material Functions ...
UMovieSceneAudioSection delegates do not get bound to recycled audio components
UE - Anim - Sequencer - Feb 2, 2026When audio sections have delegates bound to things like SetOnAudioFinished and that audio section ends up being played through a recycled audio component inside UMovieSceneAudioSystem, the delegates ...
“S” key fails to add key to transform when additive track Is locked
UE - Anim - Sequencer - Feb 2, 2026When an additive transform track is locked, pressing the “S” key does not add a new key to the sequence. No key is added to either the additive track or the base transform track. What the user expe ...
MRQ reports missing frames when rendering multiple cameras on a Sequencer camera track with Temporal Sample Count > 1
UE - Virtual Production - Tools - MRQ - Feb 2, 2026If there are multiple cameras in the Sequencer camera track, everything works correctly when the Temporal Sample Count for anti-aliasing is set to 1. However, when it is set to 3, the following erro ...