I think I found a bug in the generation of terrain, specifically in the generation of rivers, these overflow attached image. this happend in a taiga 2 times

What I expected to happen was the river dont overflow
i think that the river should have a limit and not end like this, as in the old versions.

What actually happened was the river overflow{}
the river has no limit so it ends up overflowing

Steps to Reproduce:
1. create a new world 
2. explore
3. find a taiga

4. find a river