Unreal Engine Issues

Duplicate subobjects when you attach to an OptionalDefaultSubobject

I believe that this is happening because of a problem within USubobjectDataSubsystem::FindOrCreateAttachParentForComponent where it is creating duplicates of the character mesh because the "TestScen ...

Material fails to compile when virtual texture is connected to opacity mask only through Make/Break Material Attributes

If we connect a virtual texture to the opacity mask output of a material the material will fail to compile. Currently this is expected because allowing it could cause problems such as:No virtual tex ...

Editor crash after unload a data layer

USDStage - USD Material Overrides not reading

USD material overrides do not get applied properly to a USDStage prim inside UE.     When a material override that is set to a parent prim of USD Material, the override is ignored.   A usd material ...

When using OpenLevel to transition to a level with WorldPartition enabled during PIE, the log outputs "Failed to load '/Game/MapName': Can't find file."

Outputs warning logs when transitioning to the World Partition level with OpenLevel. This only occurs in PIE, not in Standalone or Package builds. In PIE, it appears that the package failed to load ...

If using BP that inherits DataAsset as Value of Map in Struct, it will be replaced with PLACEHOLDER-CLASS after restarting editor.

VRS doesn't respect the AdditionalShadingRatesSupported flag

D3D12 needs to check the flag D3D12_FEATURE_DATA_D3D12_OPTIONS6::AdditionalShadingRatesSupported and filter out VRS modes that aren't supported. This flag should be put into something like "GRHISupp ...

Foliage is not partially loaded after InstancedFoliageGridSize is changed by WorldPartitionFoliageBuilder commandlet

Changing the InstancedFoliageGridSize by the WorldPartitionFoliageBuilder commandlet will cause some of the foliage to not load correctly. ...

Crash when importing Alembic data with a large number of vertices if Merge Meshes is enabled.

Chaos : Rigid body sleeps when very small external force is applied by AddForce

When a small external force is applied to the rigid body, the VSmooth value is reset in the ResetVSmoothFromForces function. Since this function ignores the current velocity, a very small velocity ...