Unreal Engine Issues

UClass::SparseClassDataStruct null at editor-time for child blueprints until compile

Child blueprints of a blueprint of a native actor class with sparse data can have an incorrectly null SparseClassDataStruct value, and thus fail to initialzie their SparseClassData. This affects edi ...

Async Physics incorrectly interpolates when multiple physics ticks pass

If a user set the transform of a Body from the game thread and physics is running multiple async ticks perf game tick, the transforms might be being calculated incorrectly. ...

Server will process moves from client with bReplicateMovement set to false

UCharacterMovementComponent::ReplicateMoveToServer checks IsReplicatingMovement before sending moves to the server, but the server does not check IsReplicatingMovement when processing these received ...

Spline points cannot be selected on newly placed spline blueprints

Licensee reports a difference in behaviour in instanced blueprints containing SplineComponents from 5.3 to 5.4, with respect to whether a placed blueprint containing spline component instance can be ...

Crash when undoing emitter deletion in Niagara System

Packed Level Actor should adjust transforms for negatively scaled actors when adding them to ISM

When negative scaling is applied to an instance of an ISM, the instance transform is updated to apply a rotation instead. The same thing should happen when packing actors into ISMs for Packed-Level ...

delete_all_material_expressions_in_function Doesn't delete all expressions in one go.

UDN: https://udn.unrealengine.com/s/case/500QP000009NxNBYA0/deleteallmaterialexpressionsinfunction-doesnt-delete-all-expressions-in-one-go?fromCase=1 A UDN user is reporting that the delete_all_mat ...

CPF_TextExportTransient and RF_TextExportTransient inconsistent behavior

The TextExportTransient can be specified as a property flag and object flag. Behavior is inconsistent: there are many ways in which an object marked TextExportTransient can still be part of the text ...

NavMesh debug material color is changed by lighting with high lux values.

There is a clear difference in color saturation for the nav mesh debug material between when lit by a light with low lux values (6) and when lit with high lux values (1000) and eye adaption is enabl ...

Inconsistent handling of child actor component mobility mismatches.

If you have; BP_Foo, that has a ChildActorComponent of BP_Bar, and you set the Mobility of BP_Bar to Moveable, then place BP_Foo in a level and cook it. BP_Bar will end up at origin with a static at ...