Small cold_ocean biome in the middle of a plains biome

The bug

I found a small ocean biome in the middle of a plain while flying around the world.
This can't be a problem? Like a guardian monument being generated in this little microbiome spot.

How to reproduce

Seed: 4486349547273827881
Coordinates: /execute in minecraft:overworld run tp @s 3931.50 74.53 2566.50 -181.35 24.30