Sand (observed), clay (to be observed, expected by me) and others are generated at villages farms.
First screenshot in 1.10.2 and second in 16w35a, there is one sandspot more.
Seed: 1866825338280762802
Pos.: -430 70 0
MC-106804
Sandgeneration in waterspots in farms in village
Resolved
Duplicate
1
Karla Maenlest
(Unassigned)
Unconfirmed
farms, sand, village
Minecraft 1.10.2, Minecraft 16w35a
Retrieved
It just looks like the village generated on top of a couple of ponds, which generate naturally. This doesn't look like a bug to me.