While playing on a world I made in version 1.13 in 1.14, I noticed a bug where terrain pops in and out of existance while clearly in the players view at some angles. I belive this is caused by looking directly at a block to the south while blocks in the north are still visible but I'm not entirely sure since this seems to appear in odd places. Another notable event is whenever this void is on screen my framerate jumps from about 350 to 700. See the attached files below for screenshots.