Unreal Engine Issues
Unreal Engine Issues
Playing two instances of the same level sequence with an audio track will not work as expected.
UE - Anim - Sequencer - Mar 11, 2024Two instances of the same level sequence playing audio will cause the audio to stop playing. ...
Ray tracing scene doesn't reflect WPO with instance custom data
UE - Graphics Features - Ray Tracing - Sep 19, 2025When custom instance data is used to calculate WPO in a Material and applied to an ISM the WPO value in the Lumen scene (ray tracing scene) is different than the visible scene resulting in incorrect ...
OSSNull doesn't properly filter servers based on settings
UE - Online - Oct 19, 2016OSSNull doesn't properly account for bShouldAdvertise or bAllowJoinInProgress. These should be updated in OnValidQueryPacketReceieved. (Note, bShouldAdvertise is explicitly ignored in LAN matches) ...
Default value lost when placing a struct within a user defined struct
UE - Gameplay - Blueprint Editor - Sep 18, 2017The default value of a child struct that is added to anther struct is not retained in the parent. An example would be if the child struct contains an integer, the default value when added to another ...
Hair Material's Tangents input has no effect in PathTracing
UE - Graphics Features - Path Tracer - Nov 1, 2024Expectation: Tangent should work on Hair Material ...
[CrashReport] USpeedTreeImportFactory::FactoryCreateBinary()
UE - Editor - Content Pipeline - Import and Export - Sep 19, 2017This is a common and longstanding SpeedTree import crash that has occurred since at least 4.14 for over 100 users. This seems to be the same issue as a previous Jira from 4.10 which was closed wit ...
Gameplay Abilities CancelAllAbilities not working as expected
UE - Gameplay - Oct 24, 2019in AbilitySystemComponent_Abilities.cpp, line:844 CancelAllAbilities() does not appear to be working as expected. There is a check before cancelling all abilities. However, this check uses the Cl ...
Closing editor after quitting a standalone game causes a crash.
UE - Editor - UI Systems - Jan 4, 2022The editor will produce a crash most of the time when closing editor after quitting a standalone game. This is a regression due to it not occurring in 4.26. ...
LayeredBlendPerBone with BlendRootMotionBasedOnRootBone set incorrectly calculates root motion weightings with more than two sources
UE - Anim - Runtime - May 27, 2023When BlendRootMotionBasedOnRootBone is true, the code in FAnimNode_LayeredBoneBlend::Update_AnyThread that calculates the root motion weightings for the sources doesn't appear to account for the po ...
Capsule component renders incorrectly with non-uniform scale
UE - Simulation - Visual - Jan 30, 2025Capsule component renders incorrectly with non-uniform scale because the render uses the minimum between the X and Y values and the collision code uses the maximum between the two. This issue is men ...