VirtualTextureStreamingPriority cannot be set per TextureLODGroup

UE - Rendering Architecture - Dec 11, 2025

It is currently not possible to set a VirtualTextureStreamingPriority via the TextureLodGroups that are defined in a device profile. ...

Crash on 5.7 when running with the Vulkan RHI and async compute

UE - Rendering Architecture - RHI - Dec 4, 2025

Making this a placeholder for now. Will fill out the description asap ...

Issue with Niagara emitter inheritance

UE - Niagara - Dec 4, 2025

Modules in the particle spawn stage get unlocked and lose inheritance after changing the inherited emitter's interpolated spawn mode to "No Interpolation" then resetting. ...

Chaos sometimes can not generate contact points while two dynamic convex hulls actually collide. It results in instability in the contact behavior​ - such as jittering, inconsistent contact forces, or unexpected collision responses.

UE - Simulation - Core - Dec 2, 2025

Context: Chaos Physics is able to use convex hulls to represent object collision geometry for queries and simulation. Problem: Chaos sometimes can not generate contact points while two dynamic conv ...

Not all MidPhases are enumerated in TSimCallbackObject::OnMidPhaseModification

UE - Simulation - Core - Dec 2, 2025

Newly generated MidPhases are copied into the array accessible in the NarrowPhase after the OnPreSimulate callback is invoked. As a result, it is not possible to modify newly created MidPhases withi ...

DoDeferredRender will not UpdateBound correctly when NavigationCachedBoundsUpdated

UE - AI - Navigation - Dec 2, 2025

With InstancedStaticMeshComponent, after calling AddInstance, an instance that’s far away gets culled because of additional logic that was added in 5.7 to This works correctly in 5.6 and the instanc ...

Initialization error when creating FEventReply objects from Python

UE - Editor - UI Systems - UMG - Nov 28, 2025

the handled value passed to unlock_mouse is actually treated as unhandled, because FEventReply has no uproperty and no Identical()function of its own. Adding WithIdenticalViaEquality can fix this is ...

Control Rig Creation Crash Triggered by “skel” Prefix in Skeletal Mesh Name

UE - Anim - Rigging - Control Rig - Nov 27, 2025

When generating a Control Rig from a Skeletal Mesh that contains “skel” in its name—or uses it as a prefix (i.e. skel_test)—Unreal Engine crashes. The crash occurs both when using the native Creat ...

The bake_transform_with_settings method works in 5.6 but not 5.7

UE - Anim - Sequencer - Nov 26, 2025

Trying to automate the process of baking transforms via python and the identical code above works in 5.6 but not in 5.7. There are no error messages in the output log. When running in 5.7, it does ...