Unreal Engine Issues
Unreal Engine Issues
LI Property Override: LI internal references are broken when saving the overrides.
UE - World Creation - Worldbuilding Tools - Level Instances - Dec 4, 2025When Saving the level, ULevelInstancePropertyOverrideAsset::SerializeActorPropertyOverrides will run UStruct::SerializeTaggedProperties to "diff-serialize" each object against its archetype (the LI ...
Crash on 5.7 when running with the Vulkan RHI and async compute
UE - Rendering - Architecture - RHI - Dec 4, 2025Making this a placeholder for now. Will fill out the description asap ...
Issue with Niagara emitter inheritance
UE - Niagara - Dec 4, 2025Modules in the particle spawn stage get unlocked and lose inheritance after changing the inherited emitter's interpolated spawn mode to "No Interpolation" then resetting. ...
Morph target is not applied on the first frame in Level Sequence
UE - CAPT - Control Rig - Dec 4, 2025When a skeletal mesh with morph targets spawns in the sequence, the morph is not reflected in the first frame. In the ProcessStage_SkinCache call of SkeletalMesh, MorphVertexBuffer->SectionIds is ...
Mover plugin: Crash on UFloorQueryUtils::ComputeFloorDist() and other utility functions that assume the pawn uses a UCapsuleComponent
UE - Runtime - Character - Dec 4, 2025The following functions have been found to perform unchecked casts of the pawn's "UpdatedComponent" to class UCapsuleComponent, possibly resulting in crashes:UFloorQueryUtils::ComputeFloorDist()UGro ...
UInstancedStaticMeshComponent::AddInstances does not appear to be adding per-instance previous transforms when enabled
UE - Rendering - Graphics Features - Dec 3, 2025Instanced static mesh component does not add instances transforms to PerInstancePrevTransform array when using UInstancedStaticMeshComponent::AddInstances. Additionally Updating the transforms of th ...
PlayerCollision visualization incorrect on LandscapeSplineMesh when Nanite is enabled
UE - Rendering - Features - Nanite - Dec 3, 2025From licensee: I’ve found an issue with the visualization of PlayerCollisions when using LandscapeSplineMesh with a mesh that has Nanite enabled. The Chaos collisions shown in the Chaos Visual Debu ...
DoDeferredRender will not UpdateBound correctly when NavigationCachedBoundsUpdated
UE - Runtime - Character - Dec 2, 2025With InstancedStaticMeshComponent, after calling AddInstance, an instance that’s far away gets culled because of additional logic that was added in 5.7 to This works correctly in 5.6 and the instanc ...
Material LocalPosition node does not work correctly with Nanite Skinned meshes
UE - Rendering - Graphics Features - Dec 1, 2025Nanite Skinned Meshes don't receive the correct Local Position in some shadow passes. This depends on the clipmap level, and is not related to VSM caching. Unreal Engine 5.6 shows the same issue, b ...
In 5.7, a Sequencer that contains a Spawnable ChaosCacheManager will crash the Engine on EndPlay
UE - Runtime - Simulation - Nov 30, 2025In 5.7, a Sequencer that contains a Spawnable ChaosCacheManager will crash the Engine on EndPlay. The licensee has reported, and I've confirmed, that this behavior started in 5.7. I've confirmed thi ...