http://breezewiki.catsarchywsyuss6jdxlypsw5dc7owd5u5tr6bujxb7o6xw2hipqehyd.onion/minecraft/wiki/Java_Edition_removed_features
These regions, referred to as the "Vertex Far Lands", are incredibly unstable; sometimes these regions are completely solid, other times are completely empty, and other times still feature incredibly strange terrain atypical of even "The Loop" or "The Stack". With default settings, the noise would overflow at twice the distance on the Y axis as it does on the X and Z axes, at around 25,101,640 blocks.