Unreal Engine Issues
Unreal Engine Issues
Attached actors have AttachmentReplication marked as dirty every net update
UE - Networking - Feb 11, 2026In AActor::GatherCurrentMovement, bWasAttachmentModified will be set to true if the actor’s root component has an AttachParent, even if none of the values in the AttachmentReplication struct have ch ...
StaticMesh reimport not preserving support for physical material masks
UE - Simulation - Physics - Feb 10, 2026Client has a workflow issue with the reimport pipeline: UStaticMesh::bSupportPhysicalMaterialMasks should be copied over to UBodySetup::bSupportUVsAndFaceRemap before it takes effect for raycasts, ...
Using VSM and Distance Field Shadows on the same scene results in missing shadows
UE - Rendering - Graphics Features - Shadows - Feb 9, 2026Nanite geometry does not cast Distance Field Shadows outside of the clipmap range for Virtual Shadow Maps. Non-Nanite geometry does cast these shadows. ...
Client disconnected due to MissingLevelPackage in editor with Iris and server streaming enabled
UE - World Creation - Worldbuilding Tools - World Partition - Feb 9, 2026When connecting to the server, if the client activates some local cells while the connection is still pending, ULevelStreaming::IsConcernedByNetVisibilityTransactionAck will return false. In this ca ...
Missing logging or error when applying an anim instance to a skeleton that the anim instance doesn't match.
UE - Anim - Runtime - Feb 9, 2026Currently, we detect whether an anim instance is supported by the skeletal mesh and, if it isn't, unreference the instance, but we don't error or warn the user that this happened. This leads to conf ...
[AI] Navmesh tiles are fully removed when a tile containing an automatic navlink is regenerated using Dynamic Modifiers Only generation
UE - AI - Navigation - Feb 9, 2026An unusual interaction has been found when using automatic navlink generation combined with Dynamic Modifiers Only navmesh generation. When an nav area is modified in a tile that contains an automat ...
Using PCG, StaticMeshComponentPropertyOverride only takes effect when the flag ExecuteOnTheGPU is off.
UE - World Creation - Procedural Tools - Feb 9, 2026StaticMeshComponentPropertyOverride only takes effect when the flag ExecuteOnTheGPU is off. All error checking for StaticMeshComponentPropertyOverride turns off when the flag ExecuteOnTheGPU is off ...
MRG - Additional Post Process Render have a black alpha channel
UE - Virtual Production - Tools - MRQ - Feb 7, 2026Additional Post Process renders always have a black alpha channel ...
Chaos Cloth - Multiple issues with convex colliders
UE - Simulation - Visual - Feb 6, 2026Issue 1: Convex Collision Transformation Missing for External Collision Sources Issue 2: Convex CCD Stability Issues due to Plane Intersection Semantics See attached URL for more details. ...
Object Columns using soft asset references will return null results
UE - Anim - Gameplay - Feb 6, 2026We have encounter an issue in the Chooser when we setup output object column for soft reference object ptr (an optional montage object). It is working correctly when the montage is loaded. But befor ...