AreaNavModifiers generated by SplineNavModifierComponent have the component-to-world transform incorrectly applied twice

UE - AI - Navigation - Aug 15, 2025

USplineNavModifierComponent was made available in UE 5.4. It generates several FAreaNavModifier instances covering a region with a certain thickness around a USplineComponent, and worked correctly u ...

Crash when a Deferred Decal (Translucent) base material has a Nanite Override (Masked Surface) Material and the mesh has Nanite + Ray Tracing enabled.

UE - Graphics Features - Ray Tracing - Aug 14, 2025

A crash occurs when Nanite override material instance is used in a project with Ray tracing enabled where: 1 The Material assigned to the static mesh uses Deferred Decal / Translucent and the Nani ...

Rect Light not rendered correctly when using Virtual Texture as source texture

UE - Graphics Features - Aug 14, 2025

Licensees have reported that this issue occurs when rendering from the command line: Rectangular lights with virtual textures do not render when you run the "Render (Remote)" button in the Editor, a ...

Niagara Data Interface "Errors and Warning" section on Module Details not updating when error messages change

UE - Niagara - Aug 14, 2025

This is a regression: it worked correctly up to UE 5.5, but not in 5.6 or mainline latest. Possibly caused by CL 40093049. Class UNiagaraDataInterface provides virtual method GetFeedback(), which a ...

Lumen Card Sharing is active on material with custom primitive data

UE - Graphics Features - Lumen - Aug 13, 2025

The wrong emissive value may be used on Nanite objects with custom primitive data when Lumen card sharing is enabled. This issue can be mitigated with: r.LumenScene.SurfaceCache.AllowCardSharing 0 ...

Weight blended layers can leave ghost traces when cleared

UE - Graphics Tools - Terrain - Landscape - Aug 13, 2025

ACineCameraAttachMount's "Target Actor" constraint does not work with Spawnables or Replaceables in Sequencer

UE - Virtual Production - Tools - Virtual Camera - Aug 12, 2025

Constraints (UTickableConstraint) are usually created throuh the "Animation" tab available in the Editor's "Animation Mode". When created through that interface while Sequencer is open, the internal ...

Modifying PostProcess Film Slope can cause TSR to produce ghosting artefacts

UE - Graphics Features - Aug 11, 2025

When TSR is active, the scene is dark, and a foreground object is lit, modifying the Film/Slope value on a PostProcessVolume can lead to TSR ghosting. TSR occurs prior to Tonemapping, so the issue ...