Unreal Engine Issues
Unreal Engine Issues
SetInputMode_GameOnly + windowed mode: Win+Arrow window snapping stops working after dragging window across monitors on multi-display setup
UE - Editor - UI Systems - Slate - Jul 15, 2026When SetInputMode_GameOnly is applied on a PlayerController and the application runs in windowed mode on a multi-monitor setup, the Windows OS shortcut Win+Arrow (window snapping) stops functioning ...
VSM shadows are missing for non-Nanite meshes in a PPV where Megalights is disabled, but Megalights is enabled in the project
UE - Rendering - Features - Jul 14, 2026In UE 5.8 r.Visibility.LocalLightPrimitiveInteraction mode 2 (enabled if MegaLights is disabled) was added and made the new default as a performance optimization. However, this causes shadows to d ...
Can't cook a subsequent release when the project uses World Partition.
UE - Core - Data Pipeline - Cooker - Jul 14, 2026A licensee reported getting errors when cooking a subsequent release. The bug is a side effect of CL44557776 which changed the behavior when dealing with generated packages in UCookOnTheFlyServer::G ...
Deadlock while cooking groom bindings
UE - Rendering - Features - Jul 14, 2026Hi, we are experiencing random deadlocks while cooking groom bindings. We have integrated 5.8 mutable into 5.6 and are still experimenting those deadlocks which seem due to : UE_DEPRECATED(5.4, "Th ...
Cine Assembly - Cannot convert any bindings to spawnable
UE - CAPT - Tools - Shot Management - Jul 13, 2026You cannot change any binding type in bindings in Cinematic Assemblies, e.g., you cannot make something spawnable. ...
Mismatch in Landscape Layer Weights between Nanite and Non-Nanite Landscapes
UE - Rendering - Features - Nanite - Jul 13, 2026Repro project is available in the additional info URL to save repro time. Disabling Nanite on the landscape, or painting on it (which shows the non-Nanite version of the landscape) reverts the issu ...
Regarding TObjectPtr performance regression
UE - Core - Systems - Jul 13, 2026This is from the linked EPS case: ============================== When 5.0 first introduced TObjectPtr, the guidance was that it would compile down to raw pointer access in Shipping builds to ensu ...
Navigation data contained entirely within a Level Instance is not registered at runtime (PIE / standalone / packaged) in a World Partition persistent level
UE - Runtime - Character - Jul 13, 2026A licensee is composing independently-authored levels into a single World Partition persistent level by placing each as a Level Instance. NavMeshBoundsVolume / NavModifierVolume are placed inside ea ...
WorldPartition RuntimeHashSet: non-deterministic URuntimePartitionPersistent UObject name causes unstable Cooked output (RuntimePartition:DebugColor)
UE - World Creation - Worldbuilding Tools - HLOD - Jul 9, 2026During deterministic Cook / Package validation, the Cooked output of a WorldPartition map was found to vary non-deterministically between Cook runs. Diff detected in the DiffOnly Cook log:Serialize ...
UserSceneTexture not working in Virtual Reality
UE - Platform - XR - Jun 25, 2026User reports that UserSceneTextures used in Post Process Materials are only correctly rendered inside the left eye in VR. ...