Before continuing if you are reporting an issue, please ensure that all mods involved are updated to the latest version available, if your issue with with intermod compatibility such mixing C&B bits with other blocks make sure that MCMP is also updated. If your issue is a crash, be sure to include the crash log with your report.

literally what title says

For any bug reports please provide the following details as well,

• MC Version: 1.18.1
• C&B Version: 1.2.79
• Do You have Optifine: no

Does normal water render brown in that biome

nope, water in that biome render blue, is a forest the biome

Weird. I have never seen that one.
Will do some research

Not reproducable to me:

But I might have an idea what the cause is.

Can confirm, happens to me too

Fixed in 1.2.100