Unreal Engine Issues

When selecting actors via the Scene Outliner, changes during PIE aren't reflected until PIE ends

Selecting actors in the Scene Outliner during a PIE session results in the EditorWorld copy of the actor being selected. This means that changes to the actor's properties don't reflect during that P ...

Compile errors in GPU scripts aren't always reported to the Niagara Log

The Niagara log will not always show compilation errors for GPU particles. The errors are visible in the output log. ...

[MetaSounds] - Trigger on Threshold node Crashes editor on play when using literal value for threshold

Editor crashes when Trigger on Threshold node is hooked up in a Metasound graph and played using a threshold value defined on the node. If you use an Input node for the Threshold value, the crash do ...

Adding an output to the default function of a Blueprint Interface now requires the Interface to be compiled in order to change the output's values

In 4.27 immediately upon adding an output to the default function that output can be edited without needing to be compiled. In Preview 2 once an output is added the Blueprint Interface needs to be c ...

FFunctionalTestingModule::GetMapTests does not support World partition

Cook failure when World Partition maps have level instances using level blueprints

The following cook error results from attempting to package a WP map that has level instances using level BPs: LogCook: Error: PackageSplitter found the Generator package still in memory after it ...

Adding a track for LayerData.Offset to UMG Animation throws an Ensure

Adding a track for LayerData.Offset throws an ensure that states "No default blender class specified on property, and no custom blender specified on entities. Falling back to float blender." This do ...

ARCore: Camera does not function in ARDebugCheck app

The camera is not turning on when using the ARDebugCheck app. Some details:The app does not ask for Camera permission and defaults to denied.ARDebugCheck is a Black screen after selecting "Start AR" ...

Refraction can't be set using SetMaterialAttributes node in a material function.

From the UDN: Currently, I'm using UE5, but I've seen this issue occur in UE4 and I don't see any other posts on UDN about this. Refraction can only be set in material functions if using the MakeMa ...

MaterialExpressionLandscapeLayerBlend with material attributes as inputs, the output material attributes have wrong sizes

From the UDN ticket: When using MaterialExpressionLandscapeLayerBlend with material attributes as inputs, the output material attributes have wrong sizes: ie output Normal attribute cannot be conve ...