Bake To Control Rig produces empty keys when rig uses Import Skeleton in Construction Event and binding is a spawnable in a subsequence

UE - ACT Character - Control Rig - Aug 28, 2026

Bake To Control Rig fails to key procedurally-created controls when all three of the following are true:The Control Rig creates its hierarchy at runtime via Import Skeleton in the Construction Event ...

Physics simulation shows strange behavior with specific skeletal mesh configurations

UE - Simulation - Physics - Mar 3, 2017

PhAT is inconsistent on when it does and doesn't apply scale to Constraint positions. This leads to cases where the positions provided create constraints that may not work when the Preview Skeletal ...

Sessions Frontend crash when launching the "renderer" automation section without ray tracing enabled

UE - Graphics Features - Jul 7, 2022

Looks like we only need a way to disable the usage of these tests from running if ray tracing is disabled as they are ray tracing only tests. ...

Unstable automation tests in "Standard Tests" list.

UE - Rendering - Architecture - Feb 20, 2026

The two following automation tests found in the "Standard Tests" list hit exceptions & cause the editor to crash:System->Physics->Interface->BodyInstanceShaders->ShaderPreprocessor->BuiltInMacros ...

Undo change to Rest Offset causing crash in Static Mesh Editor

UE - Runtime - Simulation - Aug 8, 2023

When undoing any change to Rest Offset for a collision mesh the engine will crash. This issue is occurring in Binary //UE5/Release-5.3 @ CL 26560699 This issue is occurring in Binary //UE5/Release- ...

Crash on Importing specific Animation Only FBX

Tools - Nov 16, 2015

When importing the attached FBX file with only Animations, the editor will crash. The Same asset will import without error in 4.9.2 Crash Reporter BUGG: [Link Removed] ...

AEditorFunctionalTest causes assert in WP map

UE - World Creation - Worldbuilding Tools - World Partition - May 9, 2022

"Assertion failed: Pair != nullptr " when trying to create a basic test with AEditorFunctionalTest in a WP map. ...

Crash while scrolling through language options in Packaging settings

Tools - Jul 21, 2017

This is a trending crash in the 4.17 preview. This is a regression Broken: 4.17.0-3528061 Worked: 4.16.2-3514769 User Descriptionsproject/settings/intern..language. Crashed it just by scrolling t ...