SetPhysMaterialOverride does not work properly when using Weld Simulated Bodies enabled AttachToComponent func

When using Weld Simulated Bodies enabled AttachToComponent func, the child Primitive Component's BodyIstance ActorHandle is released. As a result, in BodyInstance.cpp, the judgment of FPhysicsCommand :: ExecuteWrite (ActorHandle, [&] (const FPhysicsActorHandle & Actor) is flipped , and because UpdatePhysicalMaterials does not work, SetPhysMaterialOverride does not function properly.

You should be able to fix this issue by modifying UpdatePhysicalMaterials as follows:

void FBodyInstance::UpdatePhysicalMaterials()
{
 SCOPE_CYCLE_COUNTER(STAT_UpdatePhysMats);
 UPhysicalMaterial* SimplePhysMat = GetSimplePhysicalMaterial();
 TArray<UPhysicalMaterial*> ComplexPhysMats = GetComplexPhysicalMaterials();
//FPhysicsCommand::ExecuteWrite(ActorHandle, [&](const FPhysicsActorHandle& Actor)
 FPhysicsCommand::ExecuteWrite(GetActorReferenceWithWelding(), [&](const FPhysicsActorHandle& Actor)
 {
 ApplyMaterialToInstanceShapes_AssumesLocked(SimplePhysMat, ComplexPhysMats);
 });
}

1. Open SlipTest_4_21 in attached project
2.  PIE

expect :The box slides in a few seconds

result : The box does NOT slide.

AttachToComponentしたコンポーネントに対してUPrimitiveComponent::SetPhysMaterialOverrideが反映されない