The bug

Partially generated structures from older versions get cut off along chunk borders.

To reproduce

1. Open the attached world Test.zip.
   1. Alternatively, open a world in 1.15.2 with the following seed and teleport to the coordinates:

      Seed: -4086024126150179283
      Coordinates: -2100 80 700
      

   2. Close the world and open it in the newest version.
2. /execute in minecraft:overworld run tp @s -2167.50 46.85 702.53 -93.60 30.75.

Expected result

Partially generated structures from older versions would not get cut off along chunk borders.