Unreal Engine Issues

Navmesh not present for Mesh Partition terrain when using world partition navmesh builder

[Link Removed] ...

Mutable COIs built from ChildCustomizableObjects are engine only but do not denote that in anyway.

When creating a Mutable setup with nested Child COs, COIs can result with Editor-Only references, which will cause the COI not appear in the build manifest and the appearance to now spawn in game. ...

Object with "defaultconfig" cannot be edited in Project Settings if their config section exists in DefaultXXX.ini

Notifies placed on the first frame of a montage using root motion don't fire

This is a regression in 5.8 caused by 47265321. It's because we now perform the montage update and dispatch the queued notifies via CharacterMovementComponent::TickCharacterPose.  But that all hap ...

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

Root motion extraction fails on blendspaces with bShouldMatchSyncPhases set

There’s a bug with the bShouldMatchSyncPhases codepath in UBlendSpace::TickAssetPlayer. That codepath calls ResetBlendSamples to give a deterministic output when advancing time on the animations ow ...

Editor crashes when overriding Texture Collection in Material Instance

When a Material uses the DefaultTextureCollection and a Material Instance overrides it - or vice versa - the Editor will crash. Note: bindlessconfiguration=Minimal or higher must be enabled to use ...

FEvaluateActorReferenceChannels don't run on GameThread

When playing back sequences on a character that is bound users will sometimes run into an ensure from FEvaluateActorReferenceChannels. ...

SplineMeshComponent resources leak

A race condition occurs in the InitSplineVertexFactory_Internal }}function call, which is distributed across multiple threads. This causes {{FSplineMeshVertexFactory to be instantiated multiple time ...

Color picker widget auto-closes unnecessarily

A licensee reports that the color picket widget in Unreal Editor closes whenever a blueprint actor (map placed instance of an actor blueprint) receives a property changed event, even if the change e ...