I have the same issue. My farm is surrounded my water other than a one-block connection on each end. As soon as I try to walk on, I get pushed to the edge and into the water. If I jump onto the farm, I'm able to get onto the middle of the farm, but as soon as I start to walk on the farm, I get pushed out to the edge again. I use this farm frequently, including through pre-release 3, so it appears to be a new issue in pre-release 5.
Jeff Yeager
I have the same issue. My farm is surrounded my water other than a one-block connection on each end. As soon as I try to walk on, I get pushed to the edge and into the water. If I jump onto the farm, I'm able to get onto the middle of the farm, but as soon as I start to walk on the farm, I get pushed out to the edge again. I use this farm frequently, including through pre-release 3, so it appears to be a new issue in pre-release 5.