I took a couple of snapshots of being able to visibly see the square surrounding the desert island that designates where the max size, render distance limit, or something of the island is. It was on a desert biome, I've been to one before and it hasn't shown. This was on multiplayer, but only the host and I were on when it happened (he was afk on the starter island). I haven't tried to move back out to sea yet, as I was about to get off anyway, so I don;t know if it will have any effect on trying to leave.
output_log.txt
output_log_clean.txt