[16.0] Small cracks with water (river) can be walked on

[Panderturtle]

I found a bug, related to the new water coast mechanics. If you load an old 0.15.x map (has been tested on a map generated in 0.16.x) and have a one tile big water, you can walk over it.
If this is for reason, sorry for interupting.
Comment: I think it is on purpose, like the motto "jumping/walking over water".
Picture:

[Twinsen]

It's a feature

You can cross these very small rivers, for convenience.
They should only appear in old saves and custom maps.

[Panderturtle]

Yes, the second map have i made. Even though it won't happen on a Computer generated map, it's a cool feature.

[Zavian]

I actually think it would be cool if the game would generate those narrow rivers.