I upgraded a copy of my world to 1.18 pre-release 2 and got the taiga biome in the middle of a ocean. It has swamp biome in one side and warm ocean behind.
So I removed the chunk using the MCA Selector and opened it in 1.18 pre-release 3 and the same thing happened (see in images).
I believe there must be something with the blending systema that's causing this.
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You mean in 1.17?
My most old version of this world is in snapshot 21w40a, because I upgraded it by mistake in the launcher some weeks ago.
There is a raid farm near the coords, I deleted and uptaded the chunks next to it, so it would have less void holes underneath. If you do the same, the results must be same to 1.18 pre-release 2 and 3, I haven't tried it yet in pre-release 4.
Through google drive, here it is: https://drive.google.com/drive/folders/11uyMNELenicMpzFF2J3LzW1i187X135m?usp=sharing
Would it be possible to provide a download of the world before upgrading so we can take a look?