Unreal Engine Issues
Unreal Engine Issues
Unable to create installed build with iOS support from PC
UE - Foundation - Core - May 3, 2017Attempting to build a local binary engine from a source engine will fail when iOS support is enabled in the setup process. Command line argument (ran from Engine/Build/BatchFiles folder location): ...
Crash when opening level that uses foliage with a deleted mesh
UE - World Creation - Worldbuilding Tools - Foliage - May 31, 2017This report was logged due to a high volume of submitted crash reports. It occurs when opening a level where a deleted mesh as being used as foliage. This is a regression. The crash does not occu ...
Enabling ZenLoader causes editor crash when undoing Level Instance deletion
UE - CoreTech - Sep 5, 2024Crash reported through UDN. With ZenLoader enabled, deleting a level instance and triggering Undo causes a crash in ULandscapeComponent::PostEditUndo() The user has provided an example project th ...
PhysicsBall BP not updating location with Collision volumes
UE - Simulation - Physics - Feb 2, 2017PhysicsBallBP is unable to teleport via a collision volume (with either SetActorLocation or Teleport node). Regression: Error is not present in 4.14.3 but is present in 4.15.P3 Console error descr ...
Subsequent packaging attempts fail when packaging with Chunks, Nativization, Full Rebuild and For Distribution enabled
UE - Foundation - Cpp Tools - Automation Tool - May 4, 2017Subsequent packaging attempts when Generate Chunks, Blueprint Nativization, Full Rebuild, and For Distribution are enabled will fail. The error that appears states that the AutomationTool log file i ...
World Memory Leaks crash with a hidden sublevel to a redirector
Tools - Dec 8, 2020From UDN: The reason it crashes is because Child doesn't get garbage collected, which is because it still has the RF_Standalone flag. UEditorEngine::EditorDestroyWorld clears RF_Standalone flag ...
Mutable: Child parameters hidden when intermediate Object Group uses "All Options"
UE - Anim - Mutable - Mar 31, 2026FCustomizableInstanceDetails::FillChildrenMap() unconditionally registers parent-child relationships via __ParentParamName metadata without verifying the parent exists in the active parameter list. ...
Gameplay Ability System Attribute Modifiers with a duration (including infinite) do not respect tag requirements
UE - Gameplay - Gameplay Ability System - Feb 21, 2024When using infinite or duration-based effects, required and ignored tags will have no effect on attribute modifiers. This appears to be caused by OnAttributeAggregatorDirty (GameplayEffect.cpp:2917) ...
Translucent Wireframe Materials Exhibit TSR Aliasing/Crawling Due To Incorrect Velocity Rendering When Set to Output Depth And Velocity
UE - Rendering - Graphics Features - Nov 27, 2025Note that this bug potentially also affects a wide variety of material / geometry setups; however, a translucent wireframe setup is currently the main reproduction case. The issue may also be notice ...
Physics objects will bounce unrealistically just before coming to rest
OLD - Anim - Jun 5, 2017Physics objects will bounce unrealistically just before coming to rest. This is most noticeable with the large cube in the 1st Person template project. It also happens with the smaller cubes but not ...