World composition sublevels load blocking, can be async?

Hello, I have a level that uses World Composition, with a bunch of sublevels, and im trying to make a loading screen with animating widgets… The problem is it seems that using world composition, the load of the sublevels is blocking the main thread, so the animation is stuck.
I tried using the Movie Player, but the loading ends when the persisten level is loaded and I get black screen during the sublevels load.

Any solution?
Thanks

Async loading is working only when game is cooked and proper setting is enabled in project settings, see FAsyncLoadingThread::ShouldBeMultithreaded().
I have asked UE devs to please address this as this is very annoying not to have async behavior during development.

oh, thank you… I will test it.