Unreal Engine Issues
Unreal Engine Issues
Chaos FieldSystem examples in the engine content add field nodes every Tick, which creates too many components
UE - Simulation - Gameplay - May 5, 2026Can we add the field on construction instead of on Tick to avoid the performance overhead caused by creating too many components? ...
Project Settings for Take Recorder's Animation Recorder do not persist after editor restart
UE - Anim - Sequencer - Jun 25, 2021Animation Recorder settings do not persist after editor restart. Can be worked around by setting the values in the EditorSettings.ini file under: [/Script/TakeTrackRecorders.MovieSceneAnimatio ...
Failure to attach component in a non-nativized child Blueprint class to an inherited component from a nativized parent Blueprint class.
UE - Gameplay - Blueprint - May 30, 2018Attachment will currently fail at runtime during load and/or construction if a component from a non-nativized child Blueprint is attached to an inherited component from a parent class that is nativi ...
Blueprint Functional Tests Failing When Run Dedicated Server is Enabled
UE - Automation Test - Feb 28, 2017When Run Dedicated Server is enabled, it appears that functional tests are not able to succeed. The following error is appearing in the Automation Test Results: No functional testing script on map ...
UToolMenus::GenerateWidget can crash while calling PopulateMenuBuilder
UE - Editor - Nov 24, 2023A user reported that UToolMenus::GenerateWidget will crash if UToolMenus::AddReferencedObject is called during the construction of a menu. Using the above in-code repro steps, I can repro this in a ...
BP - Exclusive nativization will fail at cook time if a BP class includes a ChildActorComponent with a Data-Only BP set as the ChildActor class.
UE - Gameplay - Blueprint - Apr 20, 2017Note: This does not occur when the nativization mode is set to "Inclusive" in the Project settings. Current workaround: Ensure that the ChildActor class is NOT a data-only Blueprint, by adding scri ...
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 - Anim - Rigging - 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 - CoreTech - UObject - 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 ...