When you re-create a world in 1.16 or 1.16.1, set the seed box to be blank and load up the world, it will always has the same seed as the original re-created world, this only works when the seed box is set to be blank, or zero. Also this didn't happen in 1.15.2, I have been keeping up with the blog posts, I'm sorry if this was an intended feature and i have missed an update.
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Thanks but I'm still not sure because for the seed to be blank you must change it manually, as re-creating a world will just input the re-created world seed in for you, and this doesn't happen if you put a specific seed in
Also in 1.16.3 (I just made a bug report after not initially finding any - what I get for testing at 1am. heh). Kinda of annoying, though, but at least you can enter another seed as a work-around.
This is related to MC-94025.
Found this on the wiki for what it's worth:
"Re-Create"
Added option to the World selection menu.
Allows players to create a new world as a copy of an existing save, defaulting all of the world options and the world seed to match the original.
which would explain why it's using the same seed.