Unreal Engine Issues

Motion blur on player/weapons with TAA

Looks like this can occur with motion blur off aswell, so likely it's a TAA motion vector issue. Similar issue occurs in UE5 (see [Link Removed]) ...

FFastArraySerializer property not replicated when using ForceNetUpdate on dormant actor

See the linked UDN for more information. It also seems as though calling ForceNetUpdate before making the changes to the fast array results in the changes being properly replicated. ...

There's no motion blur on streaming GeometryCache

UDN customer mentioned: "there looks to be support for motion vectors as exported from DCC apps (for rare cases like fluid sim), but regular in-engine motion vector calculation for regular motion bl ...

GetMeshClothingAssetBindings have some fallback that break nested calls

Only the first call to unbindAndBackup should have the backup, this fallback create backup data for the nested call. ...

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 ...

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] ...

Nanite and Lumen Overview Visualization Mode text are shifted in 4k

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 ...