Hey ,
Can I ask what your intended functionality is? If it is fading out of a cinematic and back into gameplay, I’d highly suggest using separate fade in/fade out sequences and triggering the fade in at the end of the fade out or a frame before the end.
The other way is to manipulate the player camera’s Gain Alpha Channel. When a cinematic begins, set your player camera gain alpha to 0, then create your cinematic with the fade to black. When the cinematic ends, you can trigger the gain alpha to fade from 0 to 1 in your blueprint.
Generally, we avoid using the level sequence actor as a parent class for a BP since we recently introduced Sequencer Components.
Let me know if any of that helps. If not, we can go from there. I suspect the behavior you were seeing in 4.14 was actually a bug. Since the fade track is not tied to a specific camera, it would become problematic if we let it persist after the sequence had completed.