Have this simple setup for assembling robots from multiple parts, by attachind them to the sockets of the parent Skeletal Mesh. Until now, everything worked rather well, but in 4.21, when I turn on Simulate Physics on the parent, the robots start to fly around the scene (Static Mesh child collides with the parent).
It seems that disabling collision in Physics Editor between the bodies no longer propagates to the children atached to those bodies (via sockets, with Auto-Weld turned on).
Found kind of a workaround - adding Constraints between all those physics bodies that shouldn’t collide, and checking “Disable Collision” there in Details. But it’s a bit far from being elegant.
The question is - is it a bug, or just me doing something wrong?)
