Unreal Engine Issues
Unreal Engine Issues
If a child blueprint class has an Instanced/EditInlineNew object property, that property will always be detected as changed by the property editor (i.e. it will show a "Revert" arrow on that property), even if its properties are identical to the parent.
UE - Framework - Blueprint Editor - Dec 17, 2025Context: Blueprint classes can use Instanced/EditInlineNew object property specifiers to create and edit subobjects directly in the editor. Problem: If a child blueprint class has an Instanced/Edit ...
DynamicMaterialParameters Niagara module resets write flags on emitter update
UE - Niagara - Feb 4, 2026When using the DynamicMaterialParameters Niagara module in UE 5.6, 5.7, and UE5-Main (CL 50298778), updating an emitter causes Boolean values, such as Index0Float0Write, to reset to default values, ...
Crash when saving after resetting Instanced array element via Property Matrix on placed actors
UE - Editor - Workflow Systems - Nov 21, 2025When an Actor Component contains an Instanced UObject array marked EditDefaultsOnly, adding a new element to the Blueprint defaults correctly updates the Blueprint and its own Property Matrix. Howev ...
Ending a GameplayAbility from an AbilityTask created by the same GameplayAbility does not correctly end the AbilityTask, and it continues ticking.
UE - Gameplay - Gameplay Ability System - Feb 2, 2026When a GameplayAbility is ended from within a child AbilityTask, the AbilityTask is not cleaned up correctly. As a result, even though the GameplayAbility is no longer active, the AbilityTask contin ...
Physics Constraint Actor: When plasticity is enabled, Drive Position Target is reset to zero on constraint initialization
UE - Simulation - Core - Mar 5, 2026When a Chaos joint constraint is first created, having linear/angular plasticity enabled will unexpectedly force its linear/angular drive position target to zero on initialization, disregarding the ...
Niagara module "Beam Emitter Setup" makes attribute Emitter.BeamID flick between -1 and LoopCount every frame
UE - Niagara - Content - Mar 6, 2026When working with beam and ribbon effects in Niagara, Emitter.BeamID is used to fill Particles.RibbonID so that a looping emitter can spawn multiple discrete beams. Emitter.BeamID is assigned by mod ...
Cursor radius set via FSlateApplication::SetCursorRadius is ignored during FHittestGrid hit testing
UE - Editor - UI Systems - Slate - Mar 16, 2026The cursor radius configured through FSlateApplication::SetCursorRadius() is not respected during Slate hit testing. The radius value is correctly stored in FSlateApplication and passed into FHittes ...
Megalights support for anisotropic materials
UE - Rendering - Graphics Features - Lumen - Apr 14, 2026A licensee noticed that SUPPORTS_ANISOTROPIC_MATERIALS is not passed to FShadeLightSamplesCS::ModifyCompilationEnvironment for MegaLights ShadeLightSampleCS. Adding it fixes the issue. ...
Default level Sun Disc precision issue on Android
Docs - Samples - May 2, 2016Sun disc in the default level has precision or depth fighting issues ...
Get bounds node for the Steam VR Component Does not appear to return the actual bounds
UE - Platform - XR - Apr 11, 2016[NickW] This needs to pull the Play Bounds from Vive. The old soft / hard bounds system appears to be partially deprecated The Get bounds node does not appear to return the correct in game chaper ...