The summary was very hard to name, mostly because I have no idea how this happened, or why.

I used to have a house on top of this ravine and a secret area under it. I hid the trapdoor leading to the secret area under a jukebox. Everything used to work just fine, but I tried to do it recently in 12w50a (still not even sure if this is the cause) and when I broke the jukebox, (in creative) the game crashed, I was sent out of the game, came back, and THIS was there.

It's as if that certain area of the game was sent back in time, or caused some sort of explosion (because it messed up some of the houses nearby) because I think this is what the area looked like before I built there.

Very strange, and I'm still confused.

It doesn't seem to be caused by jukeboxes, because I tried placing one down and breaking it and nothing happened. Also didn't back up my files so now it's just gone and I have to rebuild :c

(By the way, the tree just appeared there. There was a sidewalk there before and some streetlamps)

No idea how to recreate this, sorry.