I killed the Ender Dragon, and end gateways surrounded the island. However, when I reloaded the world to take pictures for this, the game crashed. Afterwards, there was only one gateway.
Environment
I have a surface pro 2 running windows 8.1. I use the newest version of java.
Please do not mark unreleased versions (anything starting with "Future Version") as affected. You don't have access to them yet.