Campfires are see-through near trapdoors and it's smoke disappears after a few ~40 blocks away
Unlike the Java edition, the campfires can be seen through trapdoors if you are a few blocks far along with it's smoke cutting out and no longer being visible after walking about 40 blocks away from it kind of ruining the vibe of a chimney build for example. Pretty sure this is a bug regarding the smoke's radius range, hopefully it becomes fixed in the newest updates/hotfixes.