Unreal Engine Issues

MRQ - Subgraphs do not evaluate properly in Quick Render

Subgraphs do not seem to be evaluating properly with Quick Render. Message from the EPS: "While testing out Quick Render, I've found that subgraph nodes are not being evaluated. Digging into it dee ...

Invalid GUIDs on new material instance parameters cause overrides to break on base param rename

When a parameter value is assigned on a newly created material instance (constant or dynamic) using Set***ParameterValueInternal, the parameter’s ExpressionGUID is left invalid (0,0,0,0). Parameter ...

Negatively scaled box collisions render back faces in Player Collision debug view

The player collision debug visualization for negatively scaled boxes is rendering the back faces, not the front faces. The debug primitives are rendered via the dynamic mesh builder. FDynamicMeshBui ...

Hardware Lumen Surface Cache Artifacts on Nanite Geometry

When using Hardware Lumen with Nanite-enabled meshes in UE 5.6+, black / dark surface cache artifacts appear that result in generally darker and unstable lighting. These artifacts are not immediatel ...

Material Particle SubUV Sample does not work with Tex Object

The Particle SubUV Sample node uses its own texture object reference instead of the one provided by the texture object node. ...

Crash When Loading Cooked Material Assets in Editor Due to Shader Serialization

In Unreal Engine 5.6+, the new shader serialization logic in FShaderMapResourceCode::Serialize does not correctly handle cooked assets that are loaded back into the editor (e.g., from a mounted .pak ...

[PCG] Create PCG Asset from Level crashes on loaded sub-level exports

PCG Level Asset export doesn't support exporting a level while it is loaded as a sub-level. We should warn the user instead of crashing. ...

Slate text layout AllowPerCharacterWrapping issue

Customer-reported bug in TextLayout (AllowPerCharacterWrapping): Issue seems tied to bHasTrailingText handling in TextLayout.cpp (~line 694). The remainder handling after wrap inserts an extra break ...

Copy/pasting folders and root tracks doesn't paste the root tracks

Hardware Raytracing on Lumen can cause a crash on AMD Radeon GPUs

Hardware Raytracing support can cause a crash on AMD Radeon GPUs when creating the RT pipeline state. ...