Unreal Engine Issues

[SSAM]Textures that are still compiling are all counted as UnknownRef

In UE5.8, the texture scale fallback is no longer applied when SSAM is enabled. As a result, if a material cannot access its TextureStreamingData when it is loaded, its textures are treated as Unkno ...

World Partition - HLOD: baked HLOD textures contain unresolved runtime virtual texture content

Baking HLODs for actors that sample Runtime Virtual Textures produces incorrect baked textures: blurry or unresolved RVT tiles, fully black tiles on the first bake of an editor session, and washed-o ...

LevelInstance\PackedLevelActor: Problem with non-uniform negative scale.

A licensee is reporting transform issues related to using non-uniform negative scale on LevelInstances and PackedLevelActors. ...

Skeletal mesh LODs never stream up under SSAM: FSkeletalMeshSceneProxy caches ForceStreamedLOD and is never re-gathered

UE 5.8, cooked build, SSAM enabled (s.StreamableAssets.UseSimpleStreamableAssetManager=1, required by FastGeo). Symptom: characters spawn at a crude LOD and can never stream up for the lifetime of ...

Issue with UHLODBuilder::ComputeHLODHash

The HLOD content hash used to detect changes and trigger rebuilds effectively ignores everything hashed before the source-component loop — including the result of UHLODBuilderSettings::ComputeHLODHa ...

Level Instance Property Override: Actor::Tags overridden pre-CS but clobbered by RerunConstructionScripts with no post-CS re-apply

Summary When using the Level Instance Property Override system, overrides applied to `AActor::Tags` are silently lost for Blueprint actors whose Construction Script assigns or appends to `Tags`. The ...

"Move Selection to Current Level" can duplicate actors when cancelling

When moving an Actor that is referenced in the source level, UEditorEngine::CopySelectedActorsToClipboard will try to select the Actor for delete which will pull the \"Delete Referenced Actor\" dial ...

Dangling pointer + mem corruption related to OwnerLastRenderTimePtr

We've been seeing asserts and crashes related to OwnerLastRenderTimePtr. We've traced this to the mentioned pointer ending up dangling after using UActorComponent::Rename() on primitive components t ...

Level Instance Property Overrides failing in UWorldPartitionLevelStreamingDynamic::FinalizeRuntimeLevel

LevelStreamingPersistence: Crash when streaming in destroyed map actor with persisted properties

Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors and components that are part of a streamed level. Saved property values are restored when a lev ...