The screenshots are taken in the world "3116913" in 1.18-pre4 near (0, 0) at (+x, +z). The map area in "4x" are 2048x2048, and in "2x" in 512x512.
It is expected to have a similar landscape in "large 4x" and "normal 2x". However, it seems like the world generator generates a different world with large biome option.
Thank you for your report!
We're tracking this issue in MC-241483, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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