Unreal Engine Issues

Crash when a floor mesh is removed while a Vehicle has SimulatePhysics disabled

When SimulatePhysics is disabled, the constraint update is skipped, so a reference to an invalid (already-removed) particle is left behind. As a workaround, the approach suggested by the licensee — ...

UCharacterMovementComponent::CapsuleTouched crashes on UGeometryCollectionComponent overlap (unchecked USkinnedMeshComponent cast)

Summary: Confirmed that this exists in latest as well as 5.8 which is the origin or both tickets. This is a regression from 5.7 - although it looks like the guard was not aiming specifically to catch ...

NavMoverComponent ConsumeNavMovementData returns true on any repeat call within the same game frame

UNavMoverComponent::ConsumeNavMovementData returns true on any repeat call within the same game frame, even when there is no nav movement to report. Callers that trust the return value then act ...

Chaos Mover crash in standalone editor client

When using the Chaos Mover with resimulation enabled, standalone editor processes running as a client will crash around 80% of the time upon startup. ...

Mover: based movement is unsupported/unsafe on async kinematic backends

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 ...

Navigation data contained entirely within a Level Instance is not registered at runtime (PIE / standalone / packaged) in a World Partition persistent level

A licensee is composing independently-authored levels into a single World Partition persistent level by placing each as a Level Instance. NavMeshBoundsVolume / NavModifierVolume are placed inside ea ...

Chaos FieldSystem examples in the engine content add field nodes every Tick, which creates too many components

Can we add the field on construction instead of on Tick to avoid the performance overhead caused by creating too many components? ...

CharacterMovementComponent boosted upward when falling into acute-angle sloped corner

In UCharacterMovementComponent::TwoWallAdjust, characters can gain unintended upward velocity (slope boosting) when hitting corners with an acute angle (<=90 degrees) while in the Falling movement m ...

Adding a level instance to the persistent level puts its navmesh in the wrong place