Unreal Engine Issues
Unreal Engine Issues
Custom Primitive Data is not affected in the skeletal mesh on BP instances in the editor
UE - Rendering - Architecture - Jan 22, 2026Editing Custom Primitive Data values in the details panel of a placed BP actor with a Skeletal Mesh component does not reflect in the Editor viewport. ...
Crash when removing and re-adding instances to an InstancedStaticMeshComponent with PerInstanceCustomData.
UE - World Creation - Worldbuilding Tools - Jan 22, 2026When using an InstancedStaticMeshComponent with PerInstanceCustomData, the number of float elements in the "Custom Data" array should always be equal to NumCustomDataFloats multiplied by the number ...
Niagara: MeshParameterBinding property of the StaticMeshLocation module does not accept binding to parameters of type StaticMesh.
UE - Niagara - Jan 22, 2026On the details panel of the StaticMeshLocation module, when expanding the dropdown of the MeshParameterBinding property, user parameters of type StaticMesh don't show up (only those of type "Object" ...
In the level editor, when configuring a component that is part of an actor blueprint, adding entries to a TMap with C++ enum keys results in duplicate keys and an incorrect warning popup.
UE - Editor - Workflow Systems - Jan 22, 2026Note: This started happening in UE 5.4 and persists up to latest. It is probably related to [Link Removed] Closed ([Link Re ...
Changing the ComponentClass of a ACharacter twice and trying to set a SkeletalMeshAsset crashes the engine
UE - Anim - Jan 22, 2026Changing the ComponentClass of a ACharacter twice and trying to set a SkeletalMeshAsset crashes the engine with a "Cannot replace existing object of a different class" message. The conditions to re ...
PCGs Duplicate Point node option to apply in Relative Space has metadata warnings and crashes editor.
UE - World Creation - Procedural Tools - Jan 21, 2026When using the PCG Duplicate Point node's "Direction Applied in Relative Space" option, this deletes or messes with the output metadata and, if connected to an output or using it's debug mode, will ...
Memory leak in FMaterialPSORequestManager
UE - Rendering - Architecture - RHI - Jan 21, 2026Context: FMaterialPSORequestManager::PrecachePSOs() is called at runtime when an asset utilizing a material is loaded. This occurs during engine init, travel, and when any async or synchronous load ...
Rotated RetainerWidget does not account for rotation during hit testing
UE - Editor - UI Systems - Jan 21, 2026Hit testing for widgets contained within a RetainerWidget does not correctly account for rotation applied via render transforms . While the content renders with the expected rotation, hover and clic ...
UEditorEngine::OnAllPIEInstancesStarted() called prematurely, multiple times, while PIE clients are starting
UE - Gameplay - Jan 21, 2026Context 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 ...
GameplayTagQuery AutoDescription not refreshed after GameplayTag redirect on load
UE - Gameplay - Gameplay Tags - Jan 21, 2026FGameplayTagQuery 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 ...