What

I was testing something in the End on the new snapshot. I went far away from the main island and started placing blocks - they didn't show up.

Steps to reproduce

1. Go to the End
2. Place blocks in a line in any X/Z direction
3. Keep placing blocks until you reach a (empty) chunk border
4. Blocks after that border are placed invisibly
5. Re-logging shows those blocks

Extra information about my testing

I created a new world, made an end portal, then started placing blocks as soon as I teleported. Then I did the same in 15w34c, blocks are fine. I also tested on a 2nd computer, also 10.10.4, also Java 1.8.0_45 64bit, but different processor and RAM allocation. Attached screenshot from that computer as well.