Unreal Engine Issues

Incorrect geometry for OnMouseMove event on Slider with RightToLeft flow direction

When a slider is in RTL flow direction, and thus its position is changed, the handle is not drawn at the correct position during mouse drag. Instead, the handle draws as if the slider was not moved ...

UGS log a total sync time that is roughly double the actual time

PCG Volume does not regenerate after being moved through a sequencer sequence

Any transform modifications on the PCGVolume by Sequencer use USceneComponent::SetRelativeTransform directly and are not tracked by the TrackingManager (FPCGTrackingManager::OnObjectPropertyChanged ...

FBX Export - StaticMesh export to FBX crashes if UVElements has more channels than VertexInstanceUVs

As indicated in the repro steps, we have a StaticMesh asset that, for some reason, has a mismatch in their serialized bulk data where:MeshDescription->GetNumUVElementChannels() == 2FStaticMeshConstA ...

Custom Primitive Data is not affected in the skeletal mesh on BP instances in the editor

Editing 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. ...

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.

Note: 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

Changing 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 ...

Memory leak in FMaterialPSORequestManager

Context: 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 ...

GameplayTagQuery AutoDescription not refreshed after GameplayTag redirect on load

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 ...

Multicast RPCs may be sent to clients in a different level with Replication Graph

UReplicationGraph::ProcessRemoteFunction does not check if the client has the same loaded world as the server when sending a multicast RPCs. For actors that are persisted partway through a seamless ...