April 21st, 2024 - Server updated to version 2.30hApril 10th, 2024 - Server updated to version 2.30gApril 2nd, 2024 - Server updated to version 2.30f
It was because of the new safety code added in the last update. You could not swim because you had eaten with in the last hour.
It's supposed to freeze over in the winter, apparently. I think that's neat, actually. Who'd want to go for a swim in below-freezing temperatures?
For it to be able to freeze over, it would have to be non-enterable all around the year, I'm afraid. But it also always bothered me a bit the way AI just went straight through it like it was just open ground.