1 block thick lake with ravine below [v7 mapgen]

[wilkgr76]

With the v7 mapgen, I get a ravine under one block high water. The water doesn't flow down and fill up ravine though.

Seed: 7117606439375401362
Co-ords: -119.9, -2.7, -235.7

Screenshots attached.

[paramat]

The underwater tunnel entrances used to be plugged with sand, which i prefer, but that caused problems elsewhere in mapgen so now the tunnels are left open to the water.
Water flow in Minetest sometimes 'forgets' it should be flowing, not so often now but this bug used to be much worse in the past.

[maikerumine]

By placing a block next to the hanging liquids this should activate the node. Quick fix if necessary.

[wilkgr76]

By placing a block next to the hanging liquids this should activate the node. Quick fix if necessary.

And make the sand fall. :D