Mass entities initializing fragments on the incorrect archetypes due to shared CreationContext

UE - AI - Mass - Feb 3, 2026

UMassAgentSubsystem::HandlePendingInitialization creates a single FEntityCreationContext that is reused across all iterations of the PendingAgentEntities loop. When SpawnEntities eventually calls in ...

SimpleStreamableAssetManager: Memory Bloat/Leak in AssetIndexToBounds4Index

UE - World Creation - Worldbuilding Tools - Feb 3, 2026

Overview: A report has been received regarding a memory leak that eventually leads to OOM crashes when s.StreamableAssets.UseSimpleStreamableAssetManager=1 is enabled. In projects that utilize this ...

UMovieSceneAudioSection delegates do not get bound to recycled audio components

UE - Anim - Sequencer - Feb 2, 2026

When audio sections have delegates bound to things like SetOnAudioFinished and that audio section ends up being played through a recycled audio component inside UMovieSceneAudioSystem, the delegates ...

Separate out GameApplication onCreate additions always needed vs non-PSO processes

Separate out GameApplication onCreate additions always needed vs non-PSO processes by adding <GameApplicationOnCreateAdditionsAlways> for current case and moving <GameApplicationOnCreateAdditions> t ...

Crash when Background Blur is added with Instanced Stereo enabled

UE - Editor - UI Systems - UMG - Jan 26, 2026

Chaos Cloth Asset - Wrong vertex colors imported from the StaticMeshImport node.

UE - Simulation - Visual - Jan 22, 2026

The StaticMeshImport and SkeletalMeshImport nodes don’t have the correct vertex colors imported into the Cloth Asset. ...

Crash when removing and re-adding instances to an InstancedStaticMeshComponent with PerInstanceCustomData.

UE - World Creation - Worldbuilding Tools - Jan 22, 2026

When using an InstancedStaticMeshComponent with PerInstanceCustomData, the number of float elements in the "Custom Data" array should always be equal to NumCustomDataFloats multiplied by the number ...

Niagara: MeshParameterBinding property of the StaticMeshLocation module does not accept binding to parameters of type StaticMesh.

UE - Niagara - Jan 22, 2026

On the details panel of the StaticMeshLocation module, when expanding the dropdown of the MeshParameterBinding property, user parameters of type StaticMesh don't show up (only those of type "Object" ...

Rotated RetainerWidget does not account for rotation during hit testing

UE - Editor - UI Systems - Jan 21, 2026

Hit testing for widgets contained within a RetainerWidget does not correctly account for rotation applied via render transforms . While the content renders with the expected rotation, hover and clic ...