Unreal Engine Issues
Unreal Engine Issues
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 ...
Adding weights to bones doesn't properly update skeltree
UE - Runtime - Deformable - Feb 5, 2026Rounding of conversion of anim length into frames add an empty frame to the animation
UE - Editor - Open File Formats - Import and Export - Feb 5, 2026cf. https://forums.unrealengine.com/t/gltf-import-bug-animations-have-an-entire-extra-frame-when-source-animation-is-slighly-above-target-length/2697309 The GLTF importer adds an extra frame to the ...
"Could not find static actor" errors on standalone editor client when connecting to PIE server
UE - Framework - Networking - Feb 4, 2026This seems to be due to how FObjectReferenceCache and UEngineReplicationBridge handle remapping object paths for PIE. When creating the object reference handle, the object’s path should get renamed ...
Mover | FStanceModifier adjustment teleport on Crouch/Uncrouch can fail when child components intersect world
UE - Runtime - Character - 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 ...
Mass entities initializing fragments on the incorrect archetypes due to shared CreationContext
UE - Engine Scaling - Mass - Feb 3, 2026UMassAgentSubsystem::HandlePendingInitialization creates a single FEntityCreationContext that is reused across all iterations of the PendingAgentEntities loop. When SpawnEntities eventually calls in ...
SimpleStreamableAssetManager: Memory Bloat/Leak in AssetIndexToBounds4Index
UE - Engine Scaling - Streaming - Feb 3, 2026Overview: A report has been received regarding a memory leak that eventually leads to OOM crashes when s.StreamableAssets.UseSimpleStreamableAssetManager=1 is enabled. In projects that utilize this ...
UMovieSceneAudioSection delegates do not get bound to recycled audio components
zComponent - Archive - Feb 2, 2026When audio sections have delegates bound to things like SetOnAudioFinished and that audio section ends up being played through a recycled audio component inside UMovieSceneAudioSystem, the delegates ...
Incorrect geometry for OnMouseMove event on Slider with RightToLeft flow direction
UE - AI Workflows - UI Systems - Slate - Jan 28, 2026When a slider is in RTL flow direction, and thus its position is changed, the handle is not drawn at the correct position during mouse drag. Instead, the handle draws as if the slider was not moved ...