Unreal Engine Issues

[Mutable] Morph Targets can be disabled in packaged builds when Mesh Streaming is enabled

When a Mutable mesh instance is created while the actor spawns at a distance, only the low LODs are generated, and the mesh is created with no Morph Targets registered. Later, when the camera approa ...

Bake To Control Rig produces empty keys when rig uses Import Skeleton in Construction Event and binding is a spawnable in a subsequence

Bake To Control Rig fails to key procedurally-created controls when all three of the following are true:The Control Rig creates its hierarchy at runtime via Import Skeleton in the Construction Event ...

Editor crash when an unsupported material domain or blend mode is selected when previewing a Nanite mesh in the material editor

Fix in UE6: 56133257 This Jira is for 5.8.3 tracking ...

ShouldMarkSyncPhases causes pose discontinuities when sync leader changes

The issue is caused by the way that we calculate the leader sample's Time vs the follower sample’s Time and how that calculation switches on the frame when a follower sample becomes a lead sample. ...

All UKismetStringTableLibrary public method visibility unexpectedly changed from public to private.

Cannot get Texture Size property from Texture Collections

The following error is shown when attempting to use the Texture Size of a Texture Collection texture object: Texture size only available for Texture2D, TextureVirtual, Texture2DArray, VolumeTexture ...

HasVertexPositionOffsetConnected returns true even if WorldPosition output isn't connect to output

FMaterialCachedExpressionData::UpdateForExpressions iterates on all expressions, even for those that are not enabled in a material instance or not even connected to output. This will enable features ...

MRG - Cinematic Assembly Tokens From Metadata Return Empty When Rendering

Metadata defined on a Cinematic Assembly isn’t accessible as naming tokens when rendering with Movie Render Graph. Global naming tokens defined outside of a Cinematic Assembly does work but context ...

Object Mixer shows actors the World Outliner hides (5.8 is incompatible with 5.7-and-earlier behavior)

For the same project and the same filter, Object Mixer returns a different set of actors on 5.8 than it does on 5.7. Actors that the World Outliner hides now appear in the Object Mixer list. Editor ...

MID TextureCollections don't work with Post Process Overlays

TextureCollectionParameters in a material assigned to a Post Process Overlay are not overridden by a MID because CopyInterpParameters in Engine\Source\Runtime\Engine\Private\Materials\MaterialInsta ...