Unreal Engine Issues
Unreal Engine Issues
[AI] FInstancedStruct is not dupilicated properly if values are different from an Actor's defaults
UE - AI - Jan 24, 2024A licensee reports that the values of an FInstancedStruct do not get properly duplicated if they differ from the default values of the Actor or TArray to which they belong. Possible short-term wo ...
LOD glitch when using Control Rig with Import Skeleton node
UE - CAPT - Control Rig - Aug 26, 2025In Unreal Engine 5.6 and Main, a glitch occurs when switching between LODs in a character setup that uses a Control Rig to dynamically load the skeleton hierarchy through the Import Skeleton node in ...
Lumen screen traces from hair cast noising moving shadows on faces
UE - Graphics Features - Lumen - May 17, 2024There is moving blotchy noise on the head and face from hair when Lumen HZB tracing hits hair. CL 33258050 fixes the noise in the hair, but tracing still hits hair when it starts from surfaces like ...
Cook Non-Determinism in USplineComponent
UE - Editor - Feb 25, 20261. Non-Deterministic LastAuthority Serialization LastAuthority is assigned in USplineComponent::Serialize. Its value depends on the order in which the object and its archetype are serialized, leadi ...
FBX Import into Level node rotation
UE - Editor - Content Pipeline - Import and Export - Aug 9, 2016User has pointed out that generating FBX files through C++ causes the level nodes and a light node. I'm not fully versed with this, so the notes from the user may be more helpful for their descript ...
This project crashes when one Blueprint is compiled if its child Blueprint is opened in another tab
UE - Gameplay - Blueprint - Mar 18, 2015This project crashes when one Blueprint is compiled if its child Blueprint is opened in another tab. This only occurs with one Parent/Child combination: the crash occurs when compiling Building whil ...
ChildAnimBP with different skeleton than parent does not show child skeletons anims in AnimGraphOverrides
UE - Anim - Runtime - Anim Blueprints - Jul 31, 2020Create a Parent AnimBP, add any animation to it. Then create a childAnimBP from Parent. In ChildAnimBP, go to TargetSkeleton (from class settings) to change a different skeleton. Then go to the Anim ...
Foot Placement tries to step on vertical surfaces
UE - Characters - Animation - Oct 31, 2023From a community member: Are you responsible also for the FootPlacement node? Its fantastic, but there is a possible bug with the walkable surface handling. It tries to step even on vertical surfac ...
UPoseAsset::SetBasePoseName() always sets INDEX_NONE
UE - Runtime - Animation - Apr 11, 2025UPoseAsset::SetBasePoseName() does not correctly set the BasePoseIndex when a valid pose name is provided. Regardless of input, the pose defaults back to ReferencePose. Upon inspection of the implem ...
Make/Break Struct node breaks for native structs after modifying the structure in a hot reload
UE - Foundation - Cpp Tools - Hot Reload - Apr 10, 2017Changing and compiling a custom struct in C++ will break behavior of Make/Break Struct nodes in blueprints if the blueprint is saved after the compile. Regression: No - blueprint fails to save afte ...