I was playing through the beta and going seed hunting, because that's something I enjoy - I even gave some seeds on Caves and Cliffs seed picker thread. Unfortunately my comments weren't approved to be published, and I think I figured out why - when I tried to load one of the seeds I suggested (and wanted to play), I got an entirely different world generation! I also noticed that the seed number had changed on the world file, so it went from -12137462591 (what I input) to 747439297.
Trying to get to the bottom of this problem, I loaded up an entirely new world/seed and took note of the immediate surroundings/structures:
-1143542928 Spawn in a Savannah biome
At -162, 93, 101: There is a tiered acaia village with neighbouring ruined portal
Loading up the very same seed in a new world, the seed number HAS remained the same - however the surroundings are now slightly different. Essentially, the village and portal relocated to -238, 74, 74 and has a different layout.
Not sure what exactly is causing this issue - I triple-checked and I have no mods on that should be interfering with this, nor the experimental features. Just pure vanilla beta!
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We're tracking this issue in MCPE-18739, so this ticket is being resolved and linked as a duplicate.
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Coming back to add that after reinstalling the game and ensuring it was clean as can be: I still have the issue with the -12137462591 becoming 747439297 seed.
However, other seeds and generation seem to be working just fine and as expected now! -1143542928 also reverted back to its original layout/location.