Unreal Engine Issues
Unreal Engine Issues
Foliage is placed on LevelInstanceActor does not follow basecomponent when the LevelInstanceActor moves
UE - World Creation - Worldbuilding Tools - Foliage - Jun 24, 2022Foliage usually follows when the Transform of the placed ground or floor changes. However, if the ground or floor is a Level Instance Actor, it will not follow. The cause is in the code below. voi ...
Actor Class Reference can take invalid Value, can lead to crash
UE - Gameplay - Blueprint - Oct 4, 2017REGRESSION: Can be certain as this testing was blocked by [Link Removed] Through a specific chain of events (see repro), it's possible to have a non-actor as the value for an Actor Class Reference, ...
Prevent unnecessary rebuilds of windows resource files
UE - Core - Cpp Tools - UnrealBuildTool - Sep 20, 2023How Necessary are BUILT_FROM_CHANGELIST and BUILD_VERSION in Resource Files? We've been investigating ways to improve the speed of our iterative engine builds, and have found that the vast, vast maj ...
Editor crashes when attempting to open the Window menu after recompiling a Standalone Editor Window plugin
UE - Editor - UI Systems - Slate - Nov 26, 2018Generated from CrashReporter Attempting to open the Window menu in the Editor after having used the Modules window to recompile a Standalone Editor Window plugin will result in the Engine crashing. ...
Niagara Mesh Renderer registers NumParticles x NumMeshVariants TLAS instances
UE - Rendering - Graphics Features - Ray Tracing - May 28, 2026When using the Niagara Mesh Renderer with multiple mesh variants selected via MeshIndex, the number of TLAS instances allocated is NumParticles × NumMeshVariants and enabling the Path Tracer can ca ...
UCharacterMovementComponent::CapsuleTouched crashes on UGeometryCollectionComponent overlap (unchecked USkinnedMeshComponent cast)
UE - Runtime - Character - Aug 21, 2026Summary: Confirmed that this exists in latest as well as 5.8 which is the origin or both tickets. This is a regression from 5.7 - although it looks like the guard was not aiming specifically to catch ...
Crash on hot reload for DynamicDelegate
UE - Foundation - Core - Mar 23, 2020This issue may be badly implemented, but the reference to the VTable may be incorrect during a hot reload. Crash always in sample project. Summary:Call ForeachRow function in Custom Struct constr ...
Regression: Several project settings, especially from built-in Plugins, are being silently erased when previously they were not, which is perceived as a bug
UE - Core - Systems - Feb 28, 2025In UE's Project Settings, some pages are saved automatically to the project's "Config/Default<CATEGORY>.ini" file (meant to be version-controlled) on every change. Other pages have buttons "Set as D ...
FGameplayTagCountContainer::Reset() leaves explicit tag state and causes counts to accumulate
UE - Gameplay - Gameplay Tags - Aug 4, 2026[Summary] In UE 5.7 and later, if a tag is added once to an FGameplayTagCountContainer, the container is reset, and the same tag is added once more, GetExplicitTagCount() returns 2 instead of the e ...
Crash compiling animation blueprint with Spline IK node
UE - Anim - Rigging - Dec 13, 2016Crash occurs when compiling an animation blueprint with a Spline IK node. This seems to occur only with the Start and End Bone settings set a certain (perhaps incorrect) way. In the example given, ...