Asynchronzied Asset Loading Problem

i have used Asynchronous Asset Loading to load skeleton resource in my level, but it appears to have a bad card when call back to main thread,and this problem only occur in the first time load an asset.

it also happened in when i test in buleprint (run standalone game),but i think asynchronzied asset loading should not cause this problem,is there have some bug or i have did it in a wrong way.