Unreal Engine Issues
Unreal Engine Issues
Non-determinism when cooking a UProceduralMeshComponent
UE - Framework - Components - May 21, 2026We received a report from a licensee that UProceduralMeshComponent cook is not deterministic. This is related to the ProcMeshBodySetup member and the fact the UProceduralMeshComponent code changes t ...
Parent Socket property is not set from k2_attach_to
UE - Framework - Components - Feb 26, 2026To speed up our process of creating control rig assets we are working on a Python script to automate this process. We have an issue when we try to attach a static mesh component to a socket of a ske ...
Editor ensure in USceneComponent::OnComponentDestroyed during Blueprint compilation GC
UE - Framework - Components - Jan 15, 2026An editor-only ensure can trigger during BP compilation when garbage collection cleans up transient components created as part of component replacement. During recompilation, old component instances ...
ConditionalBeginDestroy on ActorComponent does not unregister the component with the world nor cause a warning
UE - Framework - Components - May 6, 2025Calling ConditionalBeginDestroy on an ActorComponent (instead of DestroyComponent) can lead to a crash due to the object not being correctly unregistered. BeginDestroy doesn't unregister tick funct ...
FSubobjectData::SetupAttachment() receives SocketName as a parameter but ignores it.
UE - Framework - Components - Apr 17, 2025When using the Subobject Data Subsystem in C++, method FSubobjectData::SetupAttachment() can be used to help attaching a component to a parent at a given socket. This function receives SocketName as ...
CableComponent particles spawn at origin when gameplay starts depending on component registration order
UE - Framework - Components - Jan 9, 2025A workaround was provided for the user, to use 'Set Attach End to Component' nodes during BeginPlay. While this fixes the issue in gameplay, the editor preview no longer syncs with gameplay. ...
Static/stationary child actor components are invisible and/or move position when placed inside a dynamically loaded level
UE - Framework - Components - Oct 31, 2024When loading a non-world partitioned level into a persistent world partitioned level, parent actors with child actor components within the loaded map will move position or become invisible. Within t ...
A Packaged build that has had an Editor Only Component added to one of its Blueprints logs a false positive warning - USimpleConstructionScript::FixupRootNodeParentReferences()
UE - Framework - Components - Oct 15, 2024A Packaged build that has had an Editor Only Component added to one of its Blueprints logs a false positive warning in USimpleConstructionScript::FixupRootNodeParentReferences(): USimpleConstructio ...
Swapping the Child Actor Class of a ChildActorComponent back to a previously selected BP leads to an Editor crash from illegal Renaming
UE - Framework - Components - Sep 11, 2024A fatal error occurs if we change a Child Actor Class from one BP (ex. "BP_A") to a different BP ( ex. "BP_B") and later change it back to the first BP (ex. "BP_A") without compiling the BP between ...
Child actor primitive root component failing to decrement attachment counter to 0 before UPrimitiveComponent::FinishDestroy
UE - Framework - Components - Aug 8, 2024Dragging a BP actor containing a child actor component of an actor class with a static mesh as its root component into the scene viewport will cause artifacts and hit SceneData.AttachmentCounter.Get ...