Unreal Engine Issues
Unreal Engine Issues
Cursor radius set via FSlateApplication::SetCursorRadius is ignored during FHittestGrid hit testing
UE - Editor - UI Systems - Slate - Mar 16, 2026The cursor radius configured through FSlateApplication::SetCursorRadius() is not respected during Slate hit testing. The radius value is correctly stored in FSlateApplication and passed into FHittes ...
Level Instance Property Overrides failing in UWorldPartitionLevelStreamingDynamic::FinalizeRuntimeLevel
UE - World Creation - Worldbuilding Tools - Mar 16, 2026AnimNotify serialization crash in editor
UE - Anim - Runtime - Mar 15, 2026The crash is caused by changing the variable type of an AnimNotify that is already referenced by a montage. This issue cannot be reproduced in 5.6. ...
UAbilityTask_SpawnActor::BeginSpawningActor may return true when SpawnedActor contains stale value
UE - Foundation - Mar 15, 2026UAbilityTask_SpawnActor::BeginSpawningActor assumes the incoming AActor*& SpawnedActor parameter is nullptr if no actor was spawned, but it does not initialize the parameter at the start of the func ...
GroomComponent: SetVisibility(false) causes per-frame simulation reset instead of stopping it
UE - Simulation - Visual - Mar 12, 2026UGroomComponent::TickComponent sets bResetSimulation = true every frame when the component is not visible. This causes NiagaraDataInterfaceHairStrands to triggering a full simulation reset every fra ...
NDC Sorting Incorrect
UE - Niagara - Rendering - Mar 12, 2026Using the new NDC BP nodes in 5.7 causes sorting to break; one system, regardless of world placement, is always drawn over the other. Even when the viewpoint puts the dominant system in the foregrou ...
Nanite Skeletal Mesh ignores Hidden Material Section flag
UE - Rendering - Graphics Features - Nanite - Mar 11, 2026Unlike non-Nanite Skeletal Meshes, Nanite-enabled Skeletal Meshes do not correctly respond to the Show flag passed via ShowMaterialSection(). Consequently, the Isolate checkbox for material slots in ...
Sequencer CR curve evaluating differently when navigating from parent sequence
UE - Anim - Anim in Engine - Mar 10, 2026Depending on whether I first open the level sequence that contains the control rig, or its parent level sequence, the animation curve will evaluate differently. ...
Nanite culling breaks on scaled object with displacement when camera enters displacement area
UE - Rendering - Graphics Features - Nanite - Mar 9, 2026Nanite tessellation, only supports calculating displacement in local space and everything gets scaled with the object scale, which is often undesirable. If the camera enters inside the area allocate ...
Panini Lens Projection and Post Process buffers broken
UE - Rendering - Graphics Features - Mar 9, 2026Panini Lens Distortion does not appear to affect some buffers (SceneDepth, CustomDepth, WorldNormal, etc.) consistently. These buffers behaved correctly in 5.3 ...