A world created in snapshot 21w39a does not have any biome blending between old and new chunks when upgraded to the current pre-release.
MC-241469
Upgrading from 21w39a to 1.18 Pre-Release 1 has harsh chunk borders
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We're tracking this issue as MC-239878, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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