Unreal Engine Issues
Unreal Engine Issues
Async Physics incorrectly interpolates when multiple physics ticks pass
UE - Runtime - Simulation - May 28, 2024If a user set the transform of a Body from the game thread and physics is running multiple async ticks perf game tick, the transforms might be being calculated incorrectly. ...
Backwards-compatibility broken for the CDOs of Python-generated Unreal Types because of missing redirectors
UE - Editor - Feb 11, 2025Previously, all Unreal Types generated by python scripts would be created inside package "/Engine/PythonTypes". This was changed by [CL 32478991 in ue5-main branch], which meant to "remove the restr ...
FStateTreeRunParallelStateTreeTask and TStateTreePropertyRef
UE - AI - StateTree - Dec 2, 2025When using a state tree that has a StateTreePropertyRef as a parameter in parallel any references will fail to resolve using the GetPropertyRef node. ...
Get Mouse Position Blueprint node returns different values outside of viewport depending on whether it was called from Event Tick, or within an Actor function
UE - Gameplay - Nov 15, 2018There seems to be a discrepancy between the output of Get Mouse Position node depending on whether the node is inside an Actor function or called from Event Tick. If the node is present inside a fun ...
A chaos vehicle that moves at very high speeds with CCD enabled on the vehicle sometimes has a collision response that is abnormal where the vehicle loses a significant amount of speed when colliding with dynamic objects configured as One Way Interaction
UE - Runtime - Character - Dec 16, 2025Context: Continuous Collision Detection (CCD) is being used on a Chaos Vehicle to avoid tunneling issues with certain surfaces as it prevents any missed collisions between fast moving particles and ...
In editor, sub level instance's streaming state persists incorrectly after toggling Level Behavior without saving
UE - World Creation - Worldbuilding Tools - Level Instances - Jun 11, 2025When adding a sub level with world partition streaming to a main level where the streaming is also enabled, setting* Level Behavior* of the sub level to Standalone, and saving the result, in the fir ...
iOS Shipping Build using std::thread crashes on launch
UE - Platform - Mobile - Jun 2, 2017A user is reporting that using the following code in a GameMode class causes shipping iOS packages to crash on launch:void ANOGSSDKGameModeBase::StartPlay() { std::thread([](){ std::clog << "THRE ...
Unresponsive black screen in standalone when enabling HMD w/ Oculus attached
UE - Platform - XR - Oct 8, 2015Going fullscreen/stereo on/enableHMD causes a play in standalone to go unresponsive and render as a black screen. Found on: Binary 4.9.2 release (from launcher/portal) UDN: https://udn.unrealengin ...
AddComponent node fails to be scheduled after adding an "expose on spawn" variable to an ActorComponent-based Blueprint Class.
UE - Gameplay - Blueprint - Nov 13, 2015If an existing AddComponent node is placed in an Actor Blueprint's Event Graph for a custom ActorComponent-based Blueprint Class, the node will fail to be scheduled after adding a variable marked "E ...
GetRandomReachablePointInRadius is displaying non reachable points when radius float values exceed 6000
UE - AI - Oct 31, 2018When creating an Actor, and placing them inside of a geometric obstacle. GetRandomReachablePointInRadius is giving only non reachable points. The behavior happens when we set our navigational mesh b ...