End Cities / Woodland Mansions don't generate completely when interrupting generation

Sometimes end cities and woodland mansions won't completely generate when I leave the game when part of the end city is generated.
What I expected to happen: an end city / woodland mansion would generate normally when it is partially seen by the player.
What really happened: when I saw a part of the end city / woodland mansion, the generator apparently forgot to fill in the chunks that were not generated, causing cut buildings and end ships.
To reproduce: Use the seed -1681023348413992357 and teleport to -9532 94 -11211 (Don't use the /locate command in 1.13.2). Wait for the chunks to load, then exit the game. When you come back, the mansion will not be completely generated.