An ensure is triggered when a StaticMesh is set inside a StaticMeshComponent on an actor, and another actor references the static mesh actor from two child actor components.

UE - Framework - Blueprint - Feb 5, 2025

There is an issue when setting a Static Mesh inside a blueprint that it is referenced by another blueprint with more than one child actor. An ensure is triggered inside the engine, and there is a ...

Inside the ViewportToolBar, the "Click to Expand" ComboButton works incorrectly with Display Scaling

UE - Editor - Applied Usability - Mar 12, 2025

When Display Scaling is applied (e.g., 125%) and the Level Viewport is resized, the ComboButton in the SViewportToolBar does not behave as expected. Normally, the ComboButton hides when there is in ...

Editor crash when using PCG self pruning and complex collision

UE - World Creation - Procedural Tools - PCG Workflow - May 14, 2025

While testing out pruning points based on collision, it was observed by the licensee that using complex collision seems to crash the editor. The editor crashes with the following error: ``` Asserti ...

Unwanted offset on curves when importing animation assets

UE - Editor - Content Pipeline - FBX - Jun 27, 2025

Hello, We seem to have encountered some unwanted behaviour when importing certain curves from our animation fbx assets into Unreal. Some of these curves don't have keys from the very first frame, b ...

When exporting from a level sequence, the LOD for the bones is based on the camera distance, instead of using LOD0

UE - Anim - Sequencer - Oct 9, 2025

When exporting a level sequence to an animation sequence, the bones used will be based on the LOD for the current camera location, instead of exporting LOD0. This is very noticable if you pull the ...

UEditorEngine::OnAllPIEInstancesStarted() called prematurely, multiple times, while PIE clients are starting

UE - Gameplay - Jan 21, 2026

Context UEditorEngine::OnAllPIEInstancesStarted() is a virtual function that gets called when launching Play-in-Editor. It can be overridden if the game project chooses to introduce a subclass of U ...

Editor ensure in USceneComponent::OnComponentDestroyed during Blueprint compilation GC

UE - Framework - Components - Jan 15, 2026

An editor-only ensure can trigger during BP compilation when garbage collection cleans up transient components created as part of component replacement. During recompilation, old component instances ...

GameplayTagQuery AutoDescription not refreshed after GameplayTag redirect on load

UE - Gameplay - Gameplay Tags - Jan 21, 2026

FGameplayTagQuery does not refresh its cached AutoDescription after GameplayTag redirects are applied during asset load. As a result, after renaming a GameplayTag and restarting the editor, the Game ...

AddActorWorldOffset offsets character blueprints faster than other actors

UE - Gameplay - Feb 22, 2016

AddActorWorldOffset offsets character blueprints faster than other actors when the character is possessed or anytime after possession/ejection has occurred. ...