Unreal Engine Issues

Crash in AWorldDataLayers::InitializeDataLayerRuntimeStates() when quickly unloading then loading a sub-world partition

From licensee: Since we integrated 5.5, we are experiencing a crash in AWorldDataLayers::InitializeDataLayerRuntimeStates() on this line check(ActiveDataLayerNames.IsEmpty() && LoadedDataLayerN ...

XR - Volumetric Clouds - VM Clouds appear overtop of meshes in the right-eye

When the user changes the Volumetric Render Target Mode, the Volumetric clouds in a scene will render in front of Static Meshes in the Right-Eye. ...

Parameter metadata not accessible if modified in Material Instance and then converted to CustomPrimitiveData

There’s a potential issue with some changes we made to UMaterialInstance::GetParameterValue (https://github.com/EpicGames/UnrealEngine/commit/8f2bebb008ba645f5938da844cd46b0925322b13). It seems as t ...

Web browser widgets prevent projects from packaging

When a project incorporates a web browser widget it will cause the project to fail during packaging and or launch on. The launch will fail and produce an error (provided below). ...

Stereo Mode Not Working on Certain Maps While Using the Vive

Two of the maps in the linked user project are not rendering in stereo while using the Vive headset. The user is experiencing gaps appearing in the scene. It may also be important to note that thi ...

Value of Mass In Kg is multiplying in value when clicked

When changing the value of Mass In Kg for a child of a Skeletal Mesh Actor, the value is getting multiplied with every select, deselect, and enter press on the value. The number the value is multipl ...

Niagara GPU Mesh Particles Not Working In Packaged Project

GPU Mesh emitters will not show up in a packaged project. Found in 4.20 CL# 4302132 and 4.21 CL# 4307852 ...

Visibility animations don't propagate to children

Nativizing a blueprint interface using TMap/TSet causes Fatal error in UHT

FPropertyBase constructor does not handle a TMap/TSet property. Following workaround can avoid this error. explicit FPropertyBase(FProperty* Property) : PropertyExportFlags(PROPEXPORT_Public) ...

Packed level actors and Level instances are sometimes not included in HLOD build on a World Partition Level

Context World Partition - Hierarchical Level of Detail (HLOD) system uses custom HLOD Layers to organize large amounts of Static Mesh Actors and generate a single proxy mesh and Material. Problem T ...