Unreal Engine Issues
Unreal Engine Issues
Custom Debug Camera Is Not Respected If Set Anywhere Other Than Code
UE - Gameplay - Gameplay Cameras - Sep 11, 2026The correct debug camera is no longer used if the class is set in a config file or within the Editor. When the debug camera is toggled on, the default will be used instead. If the class is set in co ...
Race condition in GetFunctionSig_Write() and other function signatures
UE - Rendering - Architecture - Niagara - Sep 11, 2026A race condition exists in GetFunctionSig_Write() and other places where FNiagaraFunctionSignature is lazily initialized because multiple worker threads can progress past if (!Sig.IsValid()) and st ...
Motion blur artifacting in MetaHuman Crowd demo
UE - Rendering - Features - Sep 10, 2026This issue was reported by a licensee and we also hit it during dev work on the crowds demo. It seems that this may be a general issue with motion vectors and teleporting actors as there are variou ...
TMap where key is an FString: initializer list will accept bad MakeTuple
UE - Core - Systems - Sep 2, 2026POST LINK: https://forums.unrealengine.com/t/tmap-where-key-is-an-fstring-initializer-list-will-accept-bad-maketuple/2747443 POST BODY:Summary A TMap where the key is an FString can be created lik ...
Sequencer Crash (GC Leak) in Editor
UE - ACT Character - Sequencer - Aug 31, 2026A GC leak, similar to the one fixed by 44483919 but for Level Sequences in Level Instances rather than ones with Widgets. A Level Sequence Actor in a Level Instance points to a Level Sequence Asset ...
[Mutable] Morph Targets can be disabled in packaged builds when Mesh Streaming is enabled
UE - Runtime - Mutable - Aug 28, 2026When a Mutable mesh instance is created while the actor spawns at a distance, only the low LODs are generated, and the mesh is created with no Morph Targets registered. Later, when the camera approa ...
Editor crash when an unsupported material domain or blend mode is selected when previewing a Nanite mesh in the material editor
UE - Rendering - Features - Nanite - Aug 27, 2026Fix in UE6: 56133257 This Jira is for 5.8.3 tracking ...
Cannot get Texture Size property from Texture Collections
UE - Rendering - Architecture - Materials - Aug 26, 2026The following error is shown when attempting to use the Texture Size of a Texture Collection texture object: Texture size only available for Texture2D, TextureVirtual, Texture2DArray, VolumeTexture ...
MRG - Cinematic Assembly Tokens From Metadata Return Empty When Rendering
UE - CAPT - Color Pipeline and Rendering - MRQ - Aug 25, 2026Metadata defined on a Cinematic Assembly isn’t accessible as naming tokens when rendering with Movie Render Graph. Global naming tokens defined outside of a Cinematic Assembly does work but context ...
MID TextureCollections don't work with Post Process Overlays
UE - Rendering - RHI - Aug 24, 2026TextureCollectionParameters in a material assigned to a Post Process Overlay are not overridden by a MID because CopyInterpParameters in Engine\Source\Runtime\Engine\Private\Materials\MaterialInsta ...