Don't panic right after the editor release as this is non-critical stuff. I've noticed some weird trigger areas overlapping large parts of levels made with "dex_halloween". Then I saw that those were just background objects (class "moving background"). Link to the style:
https://www.lemmingsforums.net/index.php?topic=4447.0After I catched that these were resizable I got it:
Take a resizable moving backroung object like "wallpaper_brick2" from "dex_halloween" and then increase the size. You will see that the trigger area also increases accordingly as that is needed for things like resizable water.
Of course all of this has no effect on the gameplay.
Suggestion: No effect trigger areas, like the ones from the "moving background" class, are no longer effected from an increase in size.