Unreal Engine Issues

~FStaticMesh() can crash with race condition

UDN user reported frequent crashes in FStaticMesh::~FStaticMesh() on DrawListLinks[i]->Remove(false); Crash went away after adding critical sections to FStaticMesh::LinkDrawList(), FStaticMesh::Unl ...

Regression: Crash when saving the level blueprint of a world-partition map containing any node with an unconnected input pin of type "Gameplay Attribute Structure"

In UE 5.5, when the user attempts to save the level blueprint of a world-partition map, the Editor crashes if the BP contains any node with an input pin of type "Gameplay Attribute Structure", as lo ...

Collison and Simple Collision Mip Level Crash

Niagara Fluids Plugin creates a memory reference of any saved level by only being active, before being actually used.

While Niagara Fluids Plugin is active it creates a memory reference of any saved level regardless of being actually used. Simply enabling the plugin shows a memory reference while deleting the level ...

DiffuseIndirect_Lumen_3 parameter missing and causing crash with Screen Space reflections and Lumen Async Compute

When the Reflection Method is set to Screen Space and Lumen reflections async compute is enabled Unreal will crash because DiffuseIndirect_Lumen_3 parameter missing, due to how DenoiserOutputs are o ...

Manipulating Morph Target on Master Component distorts Slave Components

Manipulating Morph Targets on Master Component distorts Slave Components. It makes no difference if the slave component has the morph target being manipulated in the master See attached image and ...

Split-screen players not rendering

When using the Create Player node to setup split-screen multiplayer, only the last player created will show properly. All other players experience render issues for their character and environment. ...

Character Blueprint Cannot Execute Montage to Play at a Negative Play Rate

While an Animation Montage can be played at a negative play rate in Persona, the user cannot use the Character Blueprint to execute this action. ...

Can't assign LightMapCoordinateIndex on Static Mesh with generated LODs

Once a static mesh have generated LODS, the only lightmap index value the static mesh editor's UI accepts is 0. We should be able to set the index to any value between 0 and 3 as long as there are ...

[Audio Modulation] - Ensure is thrown when attempting to modulate a Source Effect at runtime

Does *not* occur in editor. Only in standalone and runtime. Occurs when modulating Chorus or Bit Depth Also occurs in 5.2 and 5.3. I also noticed the test with this is supposed to set the chorus e ...