Sometimes Water/Lava flows out of newly generated Village Farms / Forges

When I entered this village, I saw water comming out from the farm like there was a hole in the farm but there isn't.

See for yourself
seed: 5481915211951425789
x = 89
y = 52
z = 28
Flatland setting: 2;7,50x3,2;1;village

---

Markku's possible explanation and what is important to know to reproduce this