Apparently the End still isn't quite as "infinite" as the Overworld. If you teleport really far away using console commands, it will stop generating. This is far enough away that it's not likely an intentional limit to the size, as it's farther than anyone is likely to actually travel, especially considering you can't set your spawn point in the End.
To reproduce:
1. Make a new creative world
2. Build and activate an End portal, or find one in a stronghold
3. Go to the End and start flying
4. Type "/tp @p 524200 70 524200"
5. Start flying southeast (F3 will tell you which direction your facing) and you'll soon notice the islands stop generating.
This has been tested with the following seeds:
-1889695025544045136
-6076282117589731523
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Confirmed, but generation started back up around x741484 z741484. I had a similar issue (MC-84753) about generation stopping after 9,975,300 x and having a large void ocean, but after about 100k blocks, generation started back up, but really glitched out. I didn't look to see if there were any other void oceans, This bug did not come up when I searched for bugs because I phrased it differently. :/
That might explain the issue I had on SMP where I couldnt find the dragon. Cant test this anymore since I deleted the world because I thought it totally glitched out