Over building limit?

[ExonHUN]

I had found natural spawned portal, and I used one of them.
I spawned so high, soo I wanted to go back and get blocks or water, but I cant ues a portal, because the portal was on the building limit: 256th block, and I cant use it.

One more thing, most dimension what have trees, most of them are just dropping things and make a big lagg, so it would se soo good if you make your trees or the leaf dacey more smart.

Thanks!