I had been playing Minecraft: Java Edition when I noticed a small bizarre x-ray-like hole in a wall when I was in Front 3^rd Person perspective and might have had (I'm not sure if...) effects like speed which increases the FOV. Since this description is vague I will have attached a screenshot with an arrow pointing to the small area of the screen where I could see through walls. I also want to say that I was also using a Resource Pack at the time because I'm not sure if it is irrelevant.