LongPackageNameToFilename: Improve error message

UE - Foundation - Core - Apr 29, 2019

A customer is requesting that the error message for FPackageName::LongPackageNameToFilename get improved. He suggests that we list the valid roots as part of the message. ...

PVehicleDrive not null-ed in UWheeledVehicleMovementComponent::OnDestroyPhysicsState

UE - Simulation - Physics - Apr 30, 2019

PVehicleDrive is not null-ed during OnDestroyPhysicsState, which can lead to crashes during future function calls. ...

Niagara Components can unregister themselves in the process of component registration

UE - Niagara - May 1, 2019

Spawn system attached with a system where bAutorDestroy is true and one data interface is invalid will crash the engine. ...

UHT always runs when building a code project using a binary Engine installation even if no code change has been made

UE - Foundation - Cpp Tools - UnrealHeaderTool - May 2, 2019

When building a code project that was created with the binary Engine installed through the Launcher, UHT always runs even if no code changes have been made. This only occurs with a binary Engine ins ...

The ConstructionScript not being called on drag

Tools - May 2, 2019

The construction script for a custom actor blueprint does not execute after drag when the scene component is selected. Tested in 4.21.2 (CL - 5660361), 4.22.1 (CL - 6063286), 4.23 (CL - 6248266) ...

Level LODIndex can get stuck in a bad state

UE - World Creation - Worldbuilding Tools - World Composition - May 3, 2019

If Level LOD changes to a different LOD while first is loading, LODIndex breaks. ...

Deprecated: CharacterMovementComponent::bRequestedMoveUseAcceleration

UE - Gameplay - Player Movement - May 3, 2019

Licensee has brought into question the difference between NavMovementComp::bUseAccelerationForPaths Vs. CharacterMovementComponent::bRequestedMoveUseAcceleration. This led to a discussion in a Supp ...

FAnimInstanceProxy::LODLevel isn't initialized, causing UB in PreUpdate

OLD - Anim - Apr 29, 2019

FAnimInstanceProxy::LODLevel isn't initialized before it is used in PreUpdate, causing UB on the first call. ...

TrackFieldData and SubSectionFieldData structs not properly being serialized during cook in the Precompiled Evaluation Template

UE - Anim - Sequencer - May 3, 2019

During compile on the fly if the evaluation field is invalidated SubSectionField data will not have been properly serialized and the meta data will not be populated correctly, as the custom serializ ...

Trigger Montage Ended Event results in Unhanded Exception

OLD - Anim - May 6, 2019

TriggerMontageEndedEvent is calling RemoveAtSwap after the NotifyEnd callback which is not safe if the ActiveAninNotifyState array is modified by the callback. WorkAround:   Add a Delay node befo ...