I’ve had this problem as well. I tried to use sequencer to transition from one level to another using the level visibility track in 4.12. Everything would work fine right up until the end, where it would reset the levels back to their original states and so it would cut back to the original level.
I tried to work around this issue with custom events, but that didn’t work, it’s like sequencer takes a snapshot of the state of each actor when you start the sequence, then applies the snapshot at the end.
In my case I ended up cheating, and quickly cutting to the level just prior to starting the sequence