If I create a world with any seed, then find a structure (something that can be found with /locate structure) or decorator (something that you can't find with /locate) and then create another world with the number 4294967296 (2^32) added to the seed of the original world, then the structure and decorator locations will have the exact same x and z coordinates, the y coordinate of the mineschaft is also affected, but it is possible that the y coordinate of the ruined portals and decorators are not affected. Even the shape of the structure and the loot in the chests are the same, but not necessarily the enchantments.
Steps to reproduce:
Create a world.
Find a structure or decorator
Remember the coordinates of its location.
Create another world with the seed of the original world + the number 4294967296 added to it.
Go to the coordinates of the structure or decorator in the other world.
Observed results:
The same feature is in the same location. Even the shape of the structure and the loot are the same, but the enchantments possibly aren't.
Also, if you find an amethyst geode, the shape of the geode and the positions of the budded amethyst blocks are identical.
Lava pools are also identical.
Villages generate in the same locations in worlds with seeds differing with 2^32 as long as there is the right biome. If one of the villages is abandoned, then the other one will be too. The shape of the village depends on the biome.
Ores sometimes generate identically, sometimes just the shape of them is the same and sometimes they are different.
Dungeons are affected to some extent.
It is likely that other things that I didn't list are affected
Expected results:
All elements of a world should be unique for all 2^64 seeds.
Notes: Ruined portals and mineshafts are easier to test, because they generate in every biome. The same glitch affects some caves, decorators (features), the nether and the end. MCPE-154333 , MCPE-155137, MCPE-154947, MCPE-156090
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Strongholds are also affected (if the two worlds have the right biome at the same location for the generation of the village above), but the way the eyes of ender are positioned on the end portals could be different
I wonder, does this affect trail ruins? They recently got updated to have the same locations as Java Edition now, which I'm assuming doesn't have this bug. So, I wonder if this bug no longer affects trail ruins on Bedrock.
I do not have the Java edition of the game, but I can check it out for Bedrock edition.
Cannot reproduce for locations of trail ruins or trial chambers. This does not guarantee that the shape or the loot aren't affected.
Also, other structures are affected.
Slime chunks are affected by a similar issue. They generate independently of the world seed, but updating them would break farms. Please, don't update slime chunks unless there is a way to leave chunks that are already generated unchanged.