Unreal Engine Issues
Unreal Engine Issues
Unloading a World Partition region during nested Level Instance inline editing prevents exiting editing mode
UE - World Creation - Worldbuilding Tools - Level Instances - Jul 28, 2025In the case of a single-layer Level Instance, actors are still referenced even when the region is unloaded. However, in the case of nested Level Instances, the level being edited is discarded when t ...
Exception generated launching Horde Agent built with 5.6
UE - Foundation - Horde - Server - Jul 28, 2025The source of the problem seems to be using IOptionsSnapshot with a Singleton. Per the MS documentation for IOptionsSnapshot, "Is registered as Scoped and therefore can't be injected into a Singleto ...
Restoring AnimInstance fails when ControlRig and Motion tracks are consecutive in sequencer
UE - Anim - Anim in Engine - Jul 27, 2025In the Sequencer, Control Rig and Animation tracks are placed consecutively. During the transition, the Animation track captures the AnimInstance state before the ControlRig track's RestoreState is ...
Merge Actor - Approximate Actors algorithm is using Mesh Description directly rather than the Nanite parameters
UE - World Creation - Worldbuilding Tools - Merge Actor - Jul 25, 2025In an ideal world, all mesh merge algorithms should have the option to use as input one of the followingRender mesh (non-nanite) (+ the option to target a specific LOD)Mesh Description (+ the option ...
Artifacts appear on translucent particle systems during camera motion blur
UE - Rendering - Architecture - Jul 23, 2025Translucent particle systems exhibit visual artifacts when the camera moves, even though motion vectors are disabled for the particle emitters. While switching the Translucency Pass to "After Motio ...
Custom Primitive Data color widget not applying correctly to static mesh components in Blueprint editor.
UE - Rendering - Architecture - Materials - Jul 23, 2025Context Custom Primitive Data is used to store custom data in an index array that is accessible through Blueprint and code. This allows for variations across instances of the same mesh without needi ...
Farfield shadow in lumen scene
UE - Rendering - Graphics Features - Jul 21, 2025Shadows in the Lumen Scene from Lumen's Direct Lighting do not match the world when in the Lumen Far Field. This leads to shadows where there should not be any, and missing shadows where there shou ...
Unable to change Actor Coloration View Modes in PIE
UE - World Creation - Worldbuilding Tools - Jul 20, 2025When in PIE changing Actor Coloration view modes from the viewport visualisation mode [Liit] -> [Actor Coloration] -> ... Does not update correctly when switching view mode and sometimes isn't corr ...
Structured log automated decimal number tests fail in languages / cultures that use commas instead of periods
UE - Foundation - Jul 17, 2025The following Localisation Tests in "Engine\Source\Runtime\Core\Tests\Logging\StructuredLogFormatTest.cpp:275" TestLoc(LOCTEXT("Float", " {Float} "), ANSITEXTVIEW(R"(128.25)")); TestLoc(LOCTEXT ...
Niagara Regression - Looping particle with Spawn Burst Instantaneous on time 0.0 flickers for a frame between loops
UE - Niagara - Jul 16, 2025Note: This worked correctly up to UE 5.4, but repros from UE 5.5 up to mainline latest. If a Niagara Emitter is set up with "Spawn Burst Instantaneous" on time 0.0, and the spawned particle(s) have ...