It is possible to see too many floating islands, above the clouds, in such a way that it might be a bug in the generator – they appear above the 240 blocks and massive craters - not shown here - just seem to be their source. Also it is pretty visible one of them drops an bugged lava. I am using the downloaded demo version specifically for bugtracking. I might soon be promoted so I have free access to the game for full issue tracking.

What was expected:

The terrain to be generated regularly, and all floating isles to be not much above the ground, at not such rate, with not such size.

What happened actually:

We got a crapload of them floating, but none had trees for some reason (maybe another bug in the generator?), and were way too high, many above the 240 milestone reached in the peak of the highest floating island generated regularly in Minecraft (reference to Guiness).

How to reproduce:

Spawn in the world. Don't know exactly WHY did it happened, but it is an bug in the generator and it happens automatically and therefore it might be an feature that don't have to be specifically reproduced. Other (pre)requisites and restrictions are unknown.

PS; I wish I had opened the debug, I think it would be useful to include the debug mode open (F3) hereafter.