A lot of my converted levels need re-working, of course, due to the deadly ceiling in New Formats. A strange / funny thing I noticed on one particular level, though, is a stacker dying to the deadly ceiling.
Stackers, as we all know, in contrast to builders remain next to their stack in NeoLemmix, rather than climbing it, like in Lemmings 2: The Tribes. Of course, if a stacker is also a climber and the stack reaches all the way up of the ceiling, the climber will kill itself.
In this case, however, the stacker clearly wasn't a climber. To my understanding, it 6-pixel-jumped / "ascended" onto the stack, rather than climbing it. Usually, this doesn't work with a stack, of course, because it's 8 pixels high.
So I guess the ceiling automatically cuts off any terrain that reaches beyond the level borders?
With builders, this never becomes an issue because the lemming is always on top of the staircase.