[BUG] Rivers not generating correctly

[linwajun]

Describe the bug
I used Stockholm for testing. It's an island city in the middle of a river. However, most of the river was generated as grass, with only a few thin streams remaining.

Used bbox area
59.321105 18.061180 59.328680 18.077059

Arnis and Minecraft version
arnis:2.3.0

Screenshots

You can see that most of the areas that should have been water have been generated as grass.

Additional context
Add any other context about the problem here. If you used any more custom settings, please provide them here too. Please provide the log file if possible as well, which can be found at C:\Users\USERNAME\AppData\Local\com.louisdev.arnis\logs