Unreal Engine Issues

Setting a struct bool property (bitfield) to itself writes the wrong value

There's an issue when assigning a bitfield bool to a native bool in Blueprints. Currently, the engine erroneously treats the memory for a local bool as a uint8 bitfield, which is undefined behavior. ...

FBX reimport issue with Interchange Framework

A licensee has reported that the following repro steps can result in a "Failed to merge bones" error:One of our Skeletal Mesh assets was imported into engine version 5.4 using an older version of th ...

Changing per layer parameters in a layered material that writes to RVT can cause temporary visual corruption

When using a layered material that writes to a runtime virtual texture. Sometimes when modifying a layer parameter in the material instance editor. The cached material data in the runtime virtual ...

A 5.5 level that contains a Text3DComponent in a BP crashes the engine when opened in 5.6 (and up)

A 5.5 level that contains a Text3DComponent in a BP crashes the engine when opened in 5.6 (and up). The licensee has provided his analysis: Description: Level instance created in UE5.5 and re-saved ...

FD3D12BindlessResourceManager::GrowCPUHeap will cause GPU heap activation whether it's needed or not

The ctor of FD3D12BindlessResourceManager implies that GPU heap activation is intended to occur lazily with ERHIBindlessConfiguration::RayTracingShaders, however any call to FD3D12BindlessResourceMa ...

Download of Starter pack sometimes fails

Downsampled SceneColour textures are not invalidated after ComposeToNewSceneColor when TSR is enabled leading to AfterMotionBlur materials not rendering bloom

When an emissive AfterMotionBlur material is used with TSR, Bloom is not applied to the material. The cause for this appears to be that AfterMotionBlur materials are composed to a separate texture ...

Landscape Layer Blending Painting Issue

There are two issues when painting landscape layers.Paint: When painting between different layers, square-shaped artifacts or splotches appear.Fill Layer: The blended weights of other layers aren't ...

Crashes occur when executing MRQ while adding UMG with RetainerBox.

Create an asset containing a RetainerBox in UMG, then add the created UMG to the viewport using AddViewport. Running MRQ after this causes a crash. ...

Iris - removal of fast array item not performed on client when server array contains a non-replicated item

It is possible to add items to a replicated fast array that are not intended to be replicated to the clients. For example, FGameplayAbilitySpecContainer has a custom ShouldWriteFastArrayItem impleme ...