So, I was loading into a Minecraft world I've been playing on for some time. it's a flat world where I use to create things. I load up the world it was completely empty At first I though maybe I flew very high up to do some king of experiment but when I turned on the coordinates I found out the I was quite close to the ground. Luckily before this new beta version I created a lv 3 map of everything in this world. so I filled in a block of stone in the air placed down a ender chest to get my map and looked at the map. It seemed like every chunk I rendered in got turned to air. I though maybe it was just a visual thing. I reload the world and still nope nothing loaded. Then I decided to fly around a bit to figure things out. I found parts of skycrapers that I made and they were only the top half of the builds. At this point I knew something happened to how Minecraft worlds generate. It seems as if the world was shifted 40 blocks up but non of the original blocks were moved up. Luckily I also found another Image of the same location a from before the update.
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I am having a very similar issue, I had a very nice set up for a village that was near an ocean monument.
a few days ago I updated and reloaded into a world-one of those blood and sweat efforts worlds, I find that the village that I was in beforeΒ has clouds in it????? I check my cords and I am at Y 200, before it was at max 90. I had a suspicion that the new update had effed with the world generation, so I copied the world, went into said copy-flew around and found the ocean that was connected to the village- at Y90 hat been shifted up 100+ blocks up and eventually was cut off on new chunks that-as you may have guessed-were not oceans
I really hope this gets fixed, because this seems be becoming a prevalent and game breaking issue
Judging by the screenshots, your world did not rise, but went down. This bug is tracked inΒ MCPE-140428

Thank you for your report!
We're tracking this issue in MCPE-140428, so this ticket is being resolved and linked as a duplicate.
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Oh my God. . . What a nice building. . .