Unreal Engine Issues

Crash when Live Coding is triggered after engine source edits Blueprints using ChildActorComponent

After editing engine source files and triggering Live Coding, derived Blueprints that inherit from a Blueprint containing a ChildActorComponent cause UChildActorComponent::Serialize to run on a Live ...

FBX Import - Morph target normals not correctly applied when imported as LOD 0

This is a regression since 5.5 with skeletal meshes where morph target normal/tangent deformation only works when a mesh is imported as a LOD of an existing skeletal mesh, but not when imported as L ...

Mutable Ignores State of Modular Game Features

I’m encountering an issue when working with Mutable/Customizable Objects in combination with Modular Gameplay Features (MGF). Expected: Child Customizable Objects that are located inside a disable ...

Landscape visualizers don't work on nanite landscape

Landscape visualizers do not work on Nanite Landscapes. Also tested in //UE5/Main/, CL: 48569009 The licensee has provided a patch file with a potential fix. ...

[AI] Unable to bind to parameter properties when using a Soft Object Reference

Global parameters disappear from the binding list when a soft object reference is present. Pulling up the binding menu shows nothing for Parameters when there are only object references in the ST as ...

same PhysicsAsset refresh multi times when modify multi SkeletalBodySetup properties in same PhysAsset

USkeletalBodySetup::PostEditChangeProperty will call OwningPhysAsset->RefreshPhysicsAssetChange(), if I modify many SkeletalBodySetup properties in same PhysAsset, will cause call OwningPhysAsset-> ...

UbaAgent in 5.7 depends on qwave.dll, which is not available on Server Core

A licensee runs UbaAgent on Windows Server Core. This worked in 5.5 and 5.6, but broke in 5.7. After some investigation, they found that UbaAgent took a new (hard) dependency on qwave.dll in order ...

Controller Mapping/Unmapping on some platforms is not ideal for local multiplayer

[Link Removed] The workaround is as I posted in the UDN, to override the viewport client or to make a custom slate input mapping to change this behavior. But, there is a bug with that unmapping/l ...

[AI] SmartObjectPersistentCollection produces errors during Map Validation

SmartObjectPersistentCollection in 5.6 and later now give errors when the map validator runs due to referencing spatially loaded actors. This was working per licensee in 5.5. There was a change from ...

FBX Export - Skeletal Meshes created in Unreal with only a root bone do not export correctly