Unreal Engine Issues

Changing MaterialQualityLevel causes a crash due to a ShaderMap mismatch in UniformExpressionCache

A crash may occur when changing the MaterialQualitylevel via Scalability due to a race condition. The issue occurs because in ScalabilityCVarsSinkCallback(), when it creates the FGlobalComponentRec ...

Pasting a folder on the Outliner while LightMixer and ViewChanges windows are open/docked crashes the Editor

When both LightMixer and ViewChanges windows are open, pasting a folder into the Outliner crashes the editor. For more detailed steps, refer to the Steps To Reproduce section. This happens whenever ...

Deadlock in UAnimationSequencerDataModel::Evaluate where FScopeLock Lock(&EvaluationLock) blocks execution indefinitely

When both the Sequencer Editor and an Animation Curve Editor are open for the same animation asset, the editor freezes completely upon editing the curve. Analysis indicates that the freeze is caus ...

CSM Cached Shadows missing when changing FOV

When changing the camera FOV with r.Shadows.CSMCaching enabled, the cached shadows don't appear to be used and shadows are missing. This occurs because the r.Shadow.RadiusThreshold can be low enoug ...

bStaticWhenNotMoveable in Lighting category instead of Physics

"UPrimitiveComponent::bStaticWhenNotMoveable"'s category is set to Lighting, not Physics. This causes it to be hidden when lighting-related properties are hidden, even though it controls physics sta ...

VSM + Nanite Tessellation + Volumetric Fog Shadow leaking while the Directional lighting is rotating

Landscape component's LODBias settings is ineffective

[Image Removed] Jira Bot attaches conversation thread from Slack [Image Removed]Ryan Bickell – 2025-01-07 10:54:10 UTC Hello and happy new year! I'm messing with the Landscape component LODBias sett ...

Feature Request: Expose API to iterate the existing log categories and verbosity

Custom Water Body does not work with its own Distance Culing

WaterBodyCustom seems not to work with Distance Culling settings on its own actor, either Draw Distance/Never Distance Cull or Allow Cull Distance Volume.  It only can be controlled by the CullingD ...

Lumen tile classification flicker

While we suggest using screenpercentage at 25%, it is visible at higher percentages. Video showing the flickering:https://udn.unrealengine.com/s/contentdocument/0694z00000Qw4jPAAR ...