World dissapearing when loaded in 1.12.2 from 18w50

when loading the world 8379017597505199197 in 18w50 there did not seem to be any obvious cracks. After switching to 1.12.2i found a huge crack in the ground disrupting bedrock. To replicate use the seed above, load the world in 18w50, save and then go to 1.12.2 and in the world head to the coords below