Selected tool using ScriptableTool might get closed when selecting an exposed property.

When using a created tool of the ScriptableTool plugin, and setting an InstanceEditable variable, the tool might get close. For this to happen, we need to have a ToolPropertySet attached to the too ...

In BP/Python Editor Utilities, function SetEditorProperty() unexpectedly fails for Actor Reference Properties on External Actors.

As part of the Python and Editor Scripting Tools, it is possible to programmatically set variables in actor instances of the current level just like when using the Details Panel in the Level Editor. ...

[AI] Navmesh shows in editor but does not get loaded in PIE

UE - AI - Navigation - May 13, 2024

When using static or dynamic modifiers only navmesh, there are times that the navmesh will build and display correctly in editor, but it does not get properly loaded at runtime (PIE/SIE). The Recast ...

Conditional crash when a DragAndDrop operation is done betweeen Data Layers.

UE - World Creation - Worldbuilding Tools - Data Layers - May 8, 2024

A crash occurs to the engine as when we when have unreal as a backgroud task, and we try to drag and drop a layer to another by selecting the layer visibility button. ...

Components added to an Actor Blueprint may not be propagated to Actors inside World-Partition Level Instances

UE - Gameplay - Blueprint - Apr 29, 2024

When a world partition level (but streaming disabled) is placed as a LevelInstance in another world partition level, actors in the inner level are cooked with an outdated component hierarchy until t ...

Color shifting occurs from screen probe gather ping-pong when Lumen active

UE - Graphics Features - Lumen - Apr 29, 2024

A subtle yellow tint color shift occurs when Lumen is active due to usage of R11G11B10_Float targets, mostly from r.Lumen.ScreenProbeGather.SpatialFilterProbes where we ping-pong between R11G11B10_F ...

GPU Crash in Niagara Fluids template when WorldSpaceSize has a component at 0

UE - Niagara - Apr 26, 2024

The NiagaraFluids plugin provides several Niagara System templates to use as a starting point for the user's own Systems. The templates in category "3D Gas", such as "Grid 3D Gas Explosion", include ...

GameplayTagQuery in editor can fail to update to new values or reset after being cancelled

UE - Gameplay - Apr 25, 2024

When editing a GameplayTagQuery inside of the editor, there are times when the query editor will not update the query when selecting Ok or fail to return the query to its original state before editi ...

Masked TwoSided material causing lumen direct lighting to leak through walls

UE - Graphics Features - Lumen - Apr 23, 2024

It appears that LumenScene's Hardware Ray Tracing is causing light leaking into a sealed room (which should be perfectly black). This bug does not appear to happen on AMD GPUs. ...

Using "Change Class" on Spawnables, Possessable references retain old Class info

UE - Anim - Sequencer - Apr 22, 2024

Changing Class for Spawnable objects in Level Sequence did not have any impact on Possesable objects in Subsequence. It's still referencing the previous Class. Also found in Release-5.4, CL: 329753 ...