one x-ray side block bug lagging

my Minecraft bug I'm having is whenever I build something for a long time I've been in the world for a long time I start turn head back the world starts generating up again and as it does it when I come over a block that I can't see it's invisible to the eye after I turn around and look at the same block I'm looking at the one side is x-rayed through I could see it and it start to lag me y game out so bad I crash some times it's not the chat but if you look in the world the blocks are invisible x-rays for anybody see through over at the bottom right corner in the world it be it's been happening with me for the past 2 years when I had got back in playing Minecraft again I thang it will be fixed in no time but it never got fixed and it's still happening with me