Unreal Engine Issues
Unreal Engine Issues
Directly opening a modified map asset of a streaming sublevel does not always force it to be reloaded (inconsistent with other map open behaviors)
UE - World Creation - Worldbuilding Tools - Feb 10, 2026When the level currently being edited has unsaved changes and the user opens a new one, the Editor asks if the changes should be saved. If the user answers negatively, the level asset is reverted to ...
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 - Runtime - Animation - 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 ...
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 ...
Landscape HLODs are broken in 5.7.2 (Github Release branch)
UE - World Creation - Worldbuilding Tools - HLOD - Feb 6, 2026Landscape HLODs are broke when build from Editor. See repro steps above. I have not provided a repro project as it uses the open world starter map. Note that current Main has additional bugs that o ...
Animation compression deadlock
UE - Runtime - Anim BP - Feb 5, 2026The deadlock occurs when attempting to cancel compression during animation sequence destruction. The compression thread ends up deadlocking with the game thread, which is the one requesting the canc ...
Possible leak related to using Nanite meshes for Landscape
UE - Graphics Tools - Terrain - Landscape - Feb 5, 2026A licensee reported that the Bulk data for the nanite mesh generated for Landscape proxies can leak in the editor. It could appear as the normal BulkData “leadk” related to fulling loading an Asset ...
Approximate HLOD: Default materials are not compatible and get rejected by FMaterialUtilities::IsValidFlattenMaterial when forcing their use
UE - World Creation - Worldbuilding Tools - HLOD - Feb 3, 2026The Approximated Mesh HLOD layer cannot use its default materials: FullMaterialBakeOutputMaterial_PackedMRS and FullMaterialBakeOutputMaterial. The Param2D names are incompatible and the materials ...
Mover | FStanceModifier adjustment teleport on Crouch/Uncrouch can fail when child components intersect world
UE - Gameplay - Player Movement - Mover - Feb 3, 2026Context When crouching and uncrouching with Mover’s DefaultMovementSet, the pawn capsule’s half height is changed. This behavior mimics the CharacterMovementComponent. To ensure the pawn’s feet sta ...
Material Functions are incorrectly listed in the Layer Asset list
UE - Rendering - Architecture - Materials - Feb 3, 2026Since UE 5.7, Material Functions are included in the Layer Asset list of the Material Layers of an instanced material using material layers. It is also possible to drag and drop Material Functions ...