Didn’t have any issue with the sound so far,mostly because, I believe at least, since I have the Delay node to make sure it doesn’t start loading before the sound fade out is finished.
And yes, I have the Streaming Method set to blueprint, but by default I had it on Always Loaded for some reason, which made some issues as well before I figured it out.
At the beginning of the next level on BeginPlay I have RemoveAllWidgets straight out of the gate to make sure everything is gone before loading up the gameplay widgets.