Unreal Engine Issues

FScriptMapHelper::HasKey() and FScriptSetHelper::HasElement() fail on new keys with a substring of another key

Duplicate key checking in maps and sets in the editor is done via calls to FScriptMapHelper::HasKey() and FScriptSetHelper::HasElement(), but this code is checking for object names which are subsets ...

References to recompiled Blueprint CDOs that exist outside of the immediate class hierarchy are not being replaced during compilation.

Currently, the Blueprint compiler will only update references to a reinstanced CDO/archetype object if it falls within the immediate hierarchy of the Blueprint class type OR if it's a component temp ...

Static meshes disappear after changing a property in the collision category if Enable Async Static Mesh Compilation is false

Mesh painting on staticmesh doesn't always apply Colors to All LODs

See the video [Link Removed] ...

Compiling blueprint component can lose data on instances in level

Compiling a blueprint component can cause data loss on instances in the level when the component instance overrides its owning Blueprint's property value overrides back to the component archetype's ...

FBX sdk give wrong normals when compile with Visual Studio 17.4.1

At the time this Jira is created, UE 5.1 and 5.2 is using VS 17.3.6 which is working correctly. any update after should repro the issue. ...

Montages played by GAS do not respect Blend Out Time

Replicated Montages played via GAS are not blended out using the BlendOut time set in the Montage, and are instead blended out using the BlendIn time ...

Memory leak in Array draghandles in PropertyEditorHelpers.cpp

Montage sections are not respected when auto blend out is off

Sampling UV1 on a Nanite mesh with one UV channel returns a constant value

This is general for any UV channel past what the static mesh has, rather than specifically for UV channel 1. ...