Yea, it basically broke the whole game I started for Ludum Dare and I made then a whole different game. I tried to recreate it now with content example assets, interestingly it crashed a few times randomly in the level of my project while trying to. I ended up making a new level then using the dummy character of the content example but it did not happen there. But the same thing happened when using my skeleton instead. In any case it is very strange because I don’t see why the bone could manipulate the scale of the attached object.
Skull skeleton file: https://dl.dropboxusercontent.com/u/2650899/skull-scaleattachbug.zip
(Note: the mesh looks a bit funky but the bones is what matter and what I use in my game)
Simple setup, the spawned BP can be anything, just use a basic shape and make a BP out of it. The skull skeleton is just simply dropped in the level. The spawn transform can also be anything:
Here is how that bug looks. On the right is the real size of the sphere, in the middle you can see how big that sphere gets when attached to that skeleton. It is actually exactly 10 times the size:
I also tried all those attach settings but they did not change it.