Unreal Engine Issues
Unreal Engine Issues
Physics constraint component doesn't work when placed inside a child actor, while using world partition and streaming is enabled
UE - Simulation - Physics - Mar 21, 2025Context: In a World partition level, to reduce complexity and provide a scalable solution when creating new projects, grid cell streaming can be enabled. Problem: The problem is that physics constr ...
Hardware Lumen Surface Cache Artifacts on Nanite Geometry
UE - Graphics Features - Lumen - Sep 1, 2025When using Hardware Lumen with Nanite-enabled meshes in UE 5.6+, black / dark surface cache artifacts appear that result in generally darker and unstable lighting. These artifacts are not immediatel ...
A replicated Timeline's Finished output does not fire on the Client if the Server changes the Timeline Length to a shorter duration
UE - Networking - Jan 28, 2016A replicated Timeline's Finished output does not fire on the Client if the Server changes the Timeline Length to a shorter duration. Test project attached. Reproduced in 4.9.2 binary, 4.10.2 binar ...
Existing widget name error from rejected widget object.
UE - Editor - UI Systems - Dec 5, 2017Rejected widget object for paste action from other widget somehow remains in the widget editor making name conflict for other widgets. ...
Improper Rendering of Paper Sprites in Translucent Sort Axis.
UE - Graphics Features - Apr 8, 2019Regression as of 4.22. Translucent Depth Sort Policy results in improper rendering ( Z-Fighting flickering) with Paper2D Sprite Components. ...
Instanced EditInlineNew objects are parented to the CDO when used by a child BP of a parent BP that inherits from a native class
UE - Framework - Blueprint Runtime - Mar 21, 2024EditInlineNew objects added to Instanced array stored in a struct are seemingly ignored and the object is instead parented to the CDO of the owner. The owner must be the BP child of a parent BP tha ...
Reference Viewer doesn't show references to Primary Asset IDs
UE - Editor - Applied Usability - May 13, 2025Context Reference Viewer can be used to view references between assets. There is a setting 'Show Management References' whose tooltip implies that references via PrimaryAssetID should be findable t ...
Crash when a Deferred Decal (Translucent) base material has a Nanite Override (Masked Surface) Material and the mesh has Nanite + Ray Tracing enabled.
UE - Graphics Features - Ray Tracing - Aug 14, 2025A crash occurs when Nanite override material instance is used in a project with Ray tracing enabled where: 1 The Material assigned to the static mesh uses Deferred Decal / Translucent and the Nani ...
Cannot edit collision response details in SkeletalMesh components added via Blueprint.
UE - Gameplay - Blueprint - Aug 5, 2015If the mesh component is added in Blueprint (i.e. in the Blueprint editor and/or through Construction Script), then it's not possible to edit the collision response details for an instance of the co ...
[MetaSounds] - Input Parameter Settings revert to the default after a MetaSound becomes virtual
UE - Audio - MetaSounds - Sep 23, 2022On restarting from Virtualizing, any parameters set previously on a MetaSound are ignored and the MetaSound restarts with the default values. This does not behave this way with Sound Cues, in which ...