This has been a problem since before this release. I think that someone else has reported it, and it was noted as resolved. It has not been resolved. It happens in any biome.

How to create this issue: build a structure OR dig a cave. Make certain that you are in the structure or cave when you logout. When you log back in, you will be above, or to the side of, the structure or cave you were in. It's like the x, y, and z coordinates of the character don't get properly saved, or they are modified somehow in the logic of the program during log off. X is the horizontal access, y is the vertical axis, and z is the depth. I guess that the program logic could possibly indicate that a character is stuck in a block or something and so it pushes the character out.