Unreal Engine Issues

Niagara GPU particles will always have a lifetime of one second if they use a Collision Module

GPU Particles will always have a lifetime of one second when using a collision module. This is a result of an issue with how off screen timing is handled. GPU particles that are off screen should on ...

FAnimInstanceProxy::LODLevel isn't initialized, causing UB in PreUpdate

FAnimInstanceProxy::LODLevel isn't initialized before it is used in PreUpdate, causing UB on the first call. ...

Dropping a packet containing an initial replication for a Custom Delta Property breaks replication

Custom Delta Property NAK handling is done via Custom Delta Base States. Whenever we replicate a CDP, we have the implementing code return a Custom Delta Base State. However, before a CDP is ever re ...

Blueprint Array/Map properties with DefaultToInstanced types are not instanced properly

At a licensee, I discovered a problem where Blueprint-created array and map properties are not correctly propagating the ContainsInstancedReferenced property flag. This means that if you create a Ma ...

Component names do not increment correctly when duplicating a component whose name ends with a number

REGRESSION: Yes, this does not occur in 4.21. This also occurred before CL 58120777, which fixed [Link Removed] Duplicating or Copy/Pasting a component whose name ends in a number does not increme ...

Two Incompatible Object types are able to connect via add array in Blueprint Graph.

it is possible to connect two incompatible types to an Array Blueprint function node by connecting the Item pin first.  The type of Array function nodes is determined by the first thing connected t ...

iOS fails during build step with OSS Facebook plugin enabled due to spaces in filepath

When a user tries to package or launch onto an iOS device they will fail at the build step due to:[3/8] sh Unzipping: /Users/Shared/Epic Games/UE_4.22/Engine/Source/ThirdParty/Facebook/IOS/FacebookS ...

Remapping morph targets will crash if you have a cloth section

By calling FLODUtilities::SimplifySkeletalMeshLOD on a mesh with cloth sections that is set to remap morph targets, a crash occurs. This seems to be due to the indexing of sections with/without incl ...

Adding a section with mesh editor mode lead to a staticmesh editor crash

Failed to launch project with -D3D10 Command Line Argument

Adding the d3d10 command line argument to a package project results in a crash. This worked normally in 4.21 and below.  ...