Unreal Engine Issues
Unreal Engine Issues
Mesh Variation node usage inside macro - lost of material slot name
UE - Anim - Mutable - Nov 14, 2025When using a mesh variation node within a macro instance script, the material slot name of the input mesh is not transferred. On the generated mesh output, the material slot name is "None" ...
Control Rig compile issue - Re-Entry of Instructions
UE - CAPT - Control Rig - Jan 8, 2026Compiling a specific graph construction generates a compile error and blocks the execution of the graph. Sync to AnimSandbox CL 49645845 See attached picture and attached Control Rrig asset ...
Crash compiling System when a Dynamic Input only outputs a numeric value
UE - Niagara - Apr 7, 2020Crash compiling System when a Dynamic Input only outputs a numeric value Crash occurs using Scratchpad and a Dynamic Input Script asset. The crash does not occur if I connect a parameter to the s ...
Duplicate keys in TMap and TSet after using FJsonObjectConverter::JsonValueToUProperty
UE - Core - Systems - Nov 16, 2021Found here: [Link Removed] The relevant sections in ConvertScalarJsonValueToFPropertyWithContainer() use script helpers to add defaulted elements to each container and then parse straight into them ...
Selecting an asset directly in a blueprint method parameter asset selector fails when the parameter type is an interface.
UE - Framework - Blueprint Compiler - Oct 20, 2023Ensure message: Ensure condition failed: false [KismetCompilerVMBackend.cpp][Line: 1076] It is not possible to express this interface property as a literal value! (InterfaceProperty /Script/BugRepr ...
Crash on Package When Using Nativizing Animation Blueprint Has AnimGraph Connected with Enum
UE - Gameplay - Blueprint - Dec 3, 2019If an AnimNode connected with Enum and AnimBP is nativized, the package will occur crash. Following settings is solve this issue. [BlueprintNativizationSettings] +ExcludedBlueprintTypes=/Script/En ...
Niagara Map Set parameters are improperly named
UE - Niagara - Mar 9, 2020Parameters are misnamed when adding a new parameter to Map Set in a Niagara Module Script Tested: 4.23.1, 4.24.3 , 4.25 preview, 4.26 (main) ...
UTextBlock::SetText doesn't work in global invalidation
UE - AI Workflows - UI Systems - Slate - Jan 24, 2022This happens on consoles running in 4k so DPIScale would be 2x. The character between lines is just a newline (Shift + Enter in the text field in editor), the text is set with SetText, possibly a f ...
Crash when trying to copy-paste nodes in a module graph
UE - Niagara - Jun 1, 2022The nodes I tried to copy are in the screenshot. Hit an ensure before the crash: Ensure condition failed: ScriptVariable != nullptr [NiagaraScriptGraphViewModel.cpp][Line: 294] Script variable sh ...
Mass Agent Component implementation triggers Aggressive Default Reference Replacement ensure
UE - Engine Scaling - 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 ...