Attaching skeletons with welding with simulation broken

Looks like there may be a missed edge cases when welding Skeletal Meshes.

If the Weld Parent has Simulate Physics enabled after welding, the parent continuously tries to depenetrate from the child (which is stuck inside due to welding).

Interesting cases:

1. Weld Parent and Actor start with Simulate Physics disabled:
If Simulate Physics is only enabled on the parent after welding, skeletal mesh blows up.

If Simulate Physics is enabled on both the parent and child:
If Parent is simulated first, bodies detach (this is different than static mesh where they
stay connected).

2. Weld Parent and Actor start with Simulate Physics enabled:
If the attach parent and actor are both set to simulated after, the weld is broken
(regardless of order).

1. Open the attach project.
2. Select the Params Actor in the world outline.
3. Under the Default Section, try various combinations of parameters.

Expected: Both sets of cubes act the same in all cases.
Actual: Certain sets of the parameters cause the cubes to behave differently.