Unreal Engine Issues
Unreal Engine Issues
Incorrect derivative ops detection when Add node is used with Nanite Pass Switch node in material graph
UE - Graphics Features - Mar 11, 2025Plugging an Add node which adds a constant value into a Nanite Pass switch node results in derivative ops to be detected where there should be none (which show up as red in the No Derivative Ops deb ...
Niagara Data Interface "Errors and Warning" section on Module Details not updating when error messages change
UE - Niagara - Aug 14, 2025This is a regression: it worked correctly up to UE 5.5, but not in 5.6 or mainline latest. Possibly caused by CL 40093049. Class UNiagaraDataInterface provides virtual method GetFeedback(), which a ...
Cumulative Patching does not work with Pak signing
UE - Foundation - Feb 20, 2024Cumulative patching is implemented by copying the generated pak files during staging of the base and each patch to the Releases directory. When creating a patch, all of the pak files from the releas ...
Undo change to Rest Offset causing crash in Static Mesh Editor
UE - Simulation - Physics - Editor - Aug 8, 2023When undoing any change to Rest Offset for a collision mesh the engine will crash. This issue is occurring in Binary //UE5/Release-5.3 @ CL 26560699 This issue is occurring in Binary //UE5/Release- ...
Reset Instance Changes to Blueprint Defaults does not reregister components
UE - Framework - Blueprint Editor - Jan 17, 2024For map placed blueprint actors with components with property modifications, when triggering Reset Instance Changes to Blueprint Default from the actor instance's Details panel, any components with ...
Interchange Runtime .glb Import Crash When Packaged
UE - Editor - Content Pipeline - Import and Export - Jun 10, 2025The runtime import process works fine in editor, but fatal error when trying to do so with packaged build of project. My function that calls ImportAsset():bool UMeshLoader::RequestMeshLoad(FString ...
Mass Agent Component implementation triggers Aggressive Default Reference Replacement ensure
UE - AI - Mass - Nov 13, 2023Workaround: Construct the DefaultSubobject with ... = CreateDefaultSubobject<UMassAgentComponent>(TEXT("MASS"), true); The issue appears to be that the DefaultSubobject holds a pointer to the CDO ...
Starting 2 editors with remote control plugin enabled will impact performance
UE - Virtual Production - IO - RemoteControl - Dec 16, 2024Launching a second editor with the websocket server enabled will try to bind to the same address as the first editor, and since the websocket server is running in the game thread, it will block the ...
Static Mesh Scene Actor Flipped Normals
UE - Rendering Architecture - Aug 31, 2023Static meshes can have normals flipped when the actor they are attached to has one component of its scale inverted. ...
Skeletal Mesh motion vector are output only for the last sample of Spatial Sample Count
UE - Virtual Production - Tools - MRQ - Jan 24, 2025Skeletal Mesh motion vectors are output only for the last sample of Spatial Sample Count, while Static Mesh motion vectors are output in all samples. UDN: [Link Removed] Slack thread: [Link Remo ...