When running around, it seems that some large swaths of chunks never fully load. I can see that there are things there, e.g. I'll see a white box outline where something is, and run into things, but they are not rendering. I didn't wait a super long time, but after 20-30 seconds they still had not rendered so I moved around. After moving and coming back they sometimes render.

Similarly configured 1.8 servers have no problem in this same environment.