Random chunks in the world will refuse to load when both Iris/Sodium (latest release) and Bedrock Waters are installed (see above attachment for a good example). Issue persists when chunks are reloaded or updated, or even if the client is reloaded entirely.

This also happens for me too. About 25% of the chunks don't load, but it appears that the caves underneath generate.

Can confirm. Most chunks with water in them are invisible when paired with the new version of Sodium (sodium-fabric-mc1.18.1-0.4.0-alpha6+build.14)

Fixed with version 1.6.2!