Unreal Engine Issues
Unreal Engine Issues
Replicating a non-root component with simulate physics enabled causes the component to be in the wrong place on spawn, on clients.
UE - Runtime - Character - Jan 20, 2025When a BP spawns another, if the spawned Actor has a non-root child component that is simulating physics, on clients, immediately after spawn, the child component will have the world position double ...
Physics Asset created with Limited Default Angular Constraint Mode will have Free Angular Constraints on editor restart
UE - Simulation - Physics - Jan 26, 2017REGRESSION No, occurs in 4.14. When creating a physics asset with Default Angular Constraint Mode set to Limited, if the user saves and restarts the editor without making any edits, the constraint ...
The Merge Actors Tool doesn't account for rotated collision shapes when doing non-uniform scaling
UE - Gameplay - Aug 30, 2016Collision shapes for merged actors using the Merge Actor tool do not account for the rotation of the actor when combining the data. It looks like the X and Y collision shape rotation in the world ...
Non-Nanite meshes not being correctly cleared from all levels of VSMs on actor destruction when r.Shadow.Virtual.NonNanite.IncludeInCoarsePages=0
UE - Rendering - Graphics Features - Shadows - Jun 15, 2026When using the r.Shadow.Virtual.NonNanite.IncludeInCoarsePages=0 to optimize VSM performance there are errors in how the VSM is invalidated when actors are destroyed with non-Nanite meshes. The curr ...
Black flickering on Mesh particles when the Renderer is set to a non-default Facing Mode or using Orient Mesh to Vector and when using Particle Position in the Material's WPO
UE - Niagara - Jul 23, 2020Black flickering on Mesh particles when set to a non-default Facing Mode or using Orient Mesh to Vector and when using Particle Position in the Material's World Position Offset ...
BP - Nativized build will crash at runtime if a non-nativized child that inherits from a nativized parent containing a ChildActorComponent sets the CAC class to a non-nativized child of a nativized BP class.
UE - Gameplay - Blueprint - Jan 26, 2020Current workaround: Add a dummy variable to either BP_Owner_Child or BP_CAC_Child to force one of the two to be nativized. ...
Sorting objects at EndLoad has a non-deterministic behavior
UE - Foundation - Core - EditorLoader - May 14, 2021This non-deterministic behavior is caused by sorting by program address. ...
Non-ASCII fonts don't display in UMG
Tools - Nov 6, 2019When using a non-ASCII language in the editor text in UMG will not display correctly. Found in 4.23.1 CL#9631420 Reproduced in 4.24 CL#10053396, 4.25 Main CL#10050790 ...
Non-deterministic packaging when iostore is enabled
UE - CoreTech - UnrealPak - Nov 21, 2021There appears to be a pattern of non-deterministic cooks when packaging with multiple chunks. In the case of these reproducible steps, only the assets of chunk1 have been modified. In this case, we ...
Update Overlaps Ignored with non-root Components
UE - Simulation - Physics - Jul 19, 2018See [Link Removed]. ...