Unreal Engine Issues

Intermittant motion blur issues in content heavy scenes

When using the following RHI/Render thread/GT sync configuration:r.OneFrameThreadLag 1r.GTSyncType 1 The previous skinning bone data can be corrupted and introduce visual artifacts on everything us ...

UGS "Copy to Workspace" copies a preset's categories but not its Custom View

Options -> Presets -> Copy to Workspace copies the selected preset's category choices into the workspace sync filter but drops the preset's Custom View lines. Binding the same preset through the Syn ...

UGS Sync Filter preset dropdown reverts to empty on reopen

In the Sync Filter dialog (Options -> Sync Filter -> Current Workspace), selecting a preset and clicking OK saves the selection correctly and it is applied at sync time, but reopening the dialog sho ...

Virtual Texture Collection doesn't show correct mip level

Textures from VirtualTextureCollections appear blurry because the correct mip level isn’t shown unless FVirtualTextureCollectionResource::InitRHI is modified in VirtualTextureCollection.cpp withProd ...

Sequencer binding resolve fails in packaged builds for actors in non spatially loaded Level Instances

Skeletal mesh LODs never stream up under SSAM: FSkeletalMeshSceneProxy caches ForceStreamedLOD and is never re-gathered

UE 5.8, cooked build, SSAM enabled (s.StreamableAssets.UseSimpleStreamableAssetManager=1, required by FastGeo). Symptom: characters spawn at a crude LOD and can never stream up for the lifetime of ...

FZipArchiveCompressTest failing to compile in non-editor Development builds

`ZipArchiveTest.cpp` fails to compile for non-editor targets in Development configuration. `FZipArchiveCompressTest::RunTest` constructs `FZipArchiveReader`, which is editor only, but that section ...

Brick Pattern Artifact in Volumetric Clouds

A licensee has reported seeing a repeating brick-like pattern in volumetric clouds when they overlap with very distant geometry (or at the transition between nearby and distant geometry). The artifa ...

FMassMoveTargetFragment::CreateNewAction does not update PreviousAction, breaking the start-of-path avoidance fade and related behavior for MassEntity crowds

In MassEntity-based crowds, when an agent transitions from Stand to Move and begins walking, the Avoidance trait parameters StartOfPathDuration and StartOfPathAvoidanceScale, which are meant to temp ...

MATERIAL_SHADINGMODEL_TOON macro is not propagated to the substrate tool BSDF material on a DDC hit

On a DDC hit, the SubstrateMaterialBsdfFeatures variable restored into MaterialCompilationOutput is not copied into SubstrateTranslatorData.SubstrateMaterialBsdfFeatures, which is referenced by the ...