Every biome added on 1.18.0 lack a defined water colors on the biome_client.json file and due to this they use a default water color #44AFF5 (that color appears to be identical to plains and sunflower plains water color, however unlike the 1.18 biomes, the plains is coded specifically to use that color).

This is different from any other biome added before and after 1.18.0 as they all are present on that file and have a specific defined water color, the biomes added on 1.18 are these: meadow, snowy slopes, grove, jagged peaks, frozen peaks and stony peaks.

Most obvious thing that happens due to this is the color that's used on the cold biomes (snowy slopes, grove, jagged peaks and frozen peaks), they have a light blue water color identical to the plains and similar to this ● instead of a dark blue one similar to other frozen biomes and this ●.