When i went to the end i noticed a strange 'black box' off in the distance. luckily, this bug is easy to ignore. the most prominent feature of this bug is that depending on your perspective the majority of the box seems to disappear into the distance except for the corners. i later realized that this black box starts to appear on when render distance is set to 5 or less, the lower the render distance the more pronounced the box is. at around render distance 3 the sky (and the box) is completely blocked out by fog. also when drinking a night vision potion this box turns white. attached are screenshots of the black box's corners at render distance 4 and the same pictured with the night vision effect

~~~_{HOW TO REPLICATE}~~~
1. set render distance to either 5 or 4 (4 works best)
2. go into end
3. diagonally off in the distance it should be relatively easy to spot.