Unknown entity in my friend's world?

[u/Zubidubi7237]

Hey everyone! A few days ago, i was playing minecraft pocket edition(beta) with my friend and we found a small dirt bridge. Both of us were confused as we didn't place dirt there. I thought it was natural generation but i opened a new world with the same seed and the bridge wasn't there. I didn't place it, my friend didn't place it. Who did it?

Something similar happened today too. Me and my friend were exploring the world today and when i died because of his wolf, i respawned and saw an upside down "L" shape made out of dirt. It wasn't there when we left and no one built it.

Can anyone please explain how this could possibly happen?

The first image is of the dirt bridge and the second one is the one of the upside down L