End City spawns with missing chunks

When opening a world in 20w28a and flying to an End City, they seem to miss a chunk and spawn corrupted. (see attachments)
When flying to the same City in 1.16.1, they spawn normally. 

What I expected to happen was...:
The End City should look normal.

What actually happened was...:
The City missed a chunk and/or spawned without a ship because of the missing chunk.

Steps to Reproduce:
1. Go to the End.
2. Look at some end cities. Some seem to spawn normal, others seem to miss a chunk.