BP property initialization fast path does not handle non-instanced properties assigned to default subobjects correctly

UE - Gameplay - Blueprint - Jul 27, 2023

Non-instanced object ref properties are incorrectly being skipped at property initialization time when Blueprint class instances are spawned with the fast property initialization path enabled. This ...

NiagaraComponent attached to the character won't stay active when travelling to a new level using seamless travel

UE - Niagara - Jul 27, 2023

The pawn character is added to APlayerController::GetSeamlessTravelActorList, so it'll be persisted during server travel. The Niagara component is spawned during BeginPlay and activated manually. W ...

In the Anim Sequence Editor set a Notify's MontageTickType to be fixed to BranchingPoint if that Notify is a Native Branching Point

UE - Anim - Gameplay - Jun 30, 2023

To avoid confusing users when working with a Native Branching Point Notify set its MontageTickType to be fixed to BranchingPoint.  ...

SceneQuery: UWorld::SweepSingleByChannel doesn't return BoneName on skeletal meshes with per-poly collision enabled

UE - Simulation - Physics - Query - Jun 28, 2023

Scene queries when encountering skeletal meshes with per-poly collision enabled do not return a bone name in the HitResult. Returning the BoneName always or having it as an option via FCollisionQuer ...

Missing shadows when combining CSMCaching and Nanite

UE - Graphics Features - Shadows - Jun 28, 2023

A Nanite primitive casting a CSM shadow on another Nanite primitive with "Cast Shadows" disabled, will have it's shadow disappear completely when r.Shadow.CSMCaching = 1. ...

Breakpoints don't work in Anim Node Functions

UE - Anim - Runtime - Anim Blueprints - Jun 27, 2023

Anim node functions are difficult to debug because breakpoints don't get triggered, and printing is difficult from within the function too. ...

Cooker Generated Packages: Actors can trigger the "load" of generated packages from linker load and load them incorrectly

UE - Foundation - Data Pipeline - Cooker - May 31, 2023

Generated packages have to be constructed by the cooker via FGeneratorPackage::CreateGeneratedUPackage. Some fields on the UPackage are set and ICookPackageSplitter->PopulateGeneratedPackage is call ...

Variant Thumbnails are washed out

UE - Editor - Content Pipeline - Variants - May 11, 2023

I think somewhere in Thumbnail Generator::Generate Thumbnail FromTexture() is applying this washout. ...

Memory leak in Array draghandles in PropertyEditorHelpers.cpp

UE - Editor - Workflow Systems - May 9, 2023