Unreal Engine Issues
Unreal Engine Issues
ApplyRootMotion**** ability tasks broadcast completion events before calling EndTask
UE - Gameplay - Gameplay Ability System - Mar 22, 2023Several ability tasks used to apply root motion sources on Characters have ordering problems between on-completion style events and ::EndTask / OnDestroy. UAbilityTask_ApplyRootMotionMoveToForce is ...
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 ...
Crash happens when changing Animation Mode to any other mode while a Control Rig is selected.
UE - Anim - Rigging - Control Rig - May 17, 2022This is a regression. Tested in //UE4/Release-4.27 CL18319896 An assertion is thrown when changing Animation Mode to any other mode while a Control Rig is selected. ...
Light as If Static setting does not Persist when Re-opening Project
Tools - Apr 28, 2016This bug was originally entered back in 4.8 as [Link Removed], but was closed as by design. The reason was, the mesh did not have Lightmap UVs, so using the 'Light as If Static' option would not wor ...
Cinematic Prestreaming does not work in Shipping Builds
UE - Graphics Features - Jan 9, 2025When the Cinematic Prestreaming plugin is used to generate and cache Virtual Texture Feedback requests, they work when played back in Unreal Editor. A Licensee has reported that they do not improve ...
RigVMRegistry : The registry is not locked for writing yet : ensure statement error during cook
UE - Anim - Rigging - Control Rig - Sep 2, 2025I am seeing an cook failure at the very beginning. It goes away with a retry step via Horde. Please find attached call stack. I am able to consistently reproduce it by wiping all the DDC cache and ...
Packaging Error When Setting Recast Nav Mesh Runtime Generation
UE - AI - Jan 25, 2016Setting the Runtime Generation on the Recast Nav Mesh to a different preset than what is set in the Project Settings causes an error to appear upon trying to package the project, and causes the pack ...
UK2Node_EnumLiteral always outputs defaulted (0) value if input pin is connected
UE - Gameplay - Blueprint - Sep 28, 2018The reported behavior repros in 4.20 and 4.21, but does not repro in 4.19. Regarding the "Literal Enum" node in blueprints: When an input enum value is connected to the input pin, the output is al ...
FSoftObjectPath properties marked as both Config and Untracked are being tracked
UE - Foundation - Core - Apr 25, 2019A licensee has found that marking an FSoftObjectPath property as Config and Untracked causes the untracking metadata to be ignored. This is because FSoftObjectPathThreadContext::GetSerializationOpt ...
Multiple setter functions in UMaterialEditingLibrary always return false even when the parameter is correctly set on the MaterialInstance.
UE - Rendering - Architecture - Materials - May 30, 2025In Unreal Engine, materials can expose parameters that can then be modified via instances (MaterialInstanceConstant). The UMaterialEditingLibrary provides several functions to modify these parameter ...