Unreal Engine Issues
Unreal Engine Issues
Destructible mesh traces fail after switching collision response
UE - Simulation - Physics - Destruction - Jun 15, 2017User reported issue on UDN, steps above and project attached. ...
NPC - Initializing a System parameter to a Niagara Parameter Collection data interface parameter does not work
UE - Niagara - Data Interface - Jan 4, 2021Initializing a System parameter to a Niagara Parameter Collection data interface parameter does not work ...
Python function unreal.AssetRegistry.get_assets_by_class is broken
UE - CoreTech - Nov 21, 2022Repro Rate: 3/3 This issue was reproduced in //UE5/Release-5.1 at CL 23058290. This is confirmed to be a regression since the errors do not occur on the previous version and is regression tested o ...
Local binary build fails with iOS platform included
UE - Foundation - Cpp Tools - Sep 26, 2018This report is very similar to [Link Removed] (the command line used to run the build is slightly different), but the build fails with a different error. In this case, a source file is being looked ...
UNetDriver server-side hitch results in ActorInfo->NextUpdateTime far into future
UE - Networking - Feb 16, 2024A high UWorld::Tick DeltaSeconds (i.e. GameThread hitch) results in a high UNetDriver::TickFlush DeltaSeconds. This DeltaSeconds can high (many seconds) if the hitch is long. This value then affects ...
Crash when duplicating the Child Actor Component class
UE - Gameplay - Components - Jun 3, 2019Creating a blueprint class with a child actor component and setting its actor class to Point Light, then copying and pasting it causes the editor to crash. Tested in 4.21.2 (CL - 4753647), 4.22.1 ...
Local binary build fails for iOS platform.
UE - Foundation - Core - Oct 5, 2017Attempting to create a local binary build of the Engine for the iOS platform using BuildGraph is currently failing. While trying to build UHT for Mac using a remote build, the build fails because it ...
Adding pin to CR node causes crash if input variable is assigned to one of the array element
UE - Anim - Rigging - Control Rig - Aug 22, 2025When a node has a variable assigned to one of its pins. You will get a crash every time you add a pin. I am sure this goes for all nodes with with the "add pin" functionality [Link Removed] ...
EQS Generators named "NewBlueprint" cause errors and crash
UE - AI - Feb 11, 2015Naming an EnvQueryGenerator_BlueprintBase derived BP "NewBlueprint" and deleting it causes new custom generators to not appear in the EQS. This can also lead to a crash when searching for the new ge ...
Crash retargeting animation with Virtual Bone
OLD - Anim - Oct 25, 2016Crash occurs when attempting to retarget an animation whose skeleton has a virtual bone. ...