Ocean's edges are abrupt sheer cliffs running N/S or E/W

Seemingly healthy world. Played it extensively, Travelled across an ocean southwards and westward. Found the opposite shore to be sheer cliffs running E/W, then N/S for long lenths. Never seen this anywhere else in this world - all other ocean shores (or any biome boundary) in this world appear natural/normal. These ocean edges appear to have been mal-formed during world generation.

World seed: 2413066527852695988

Screenshot showing part of the edge, and a map showing the straight edges attached.

What I expected to happen was...:
To see a natural-looking biome transition

What actually happened was...:
Biome transition was an abrupt wall (literally), running long in a N/S direction. Another one found neaby running long in an E/W direction.

Steps to Reproduce:
1. Create survival world with seed value provided above.
2. Navigate to coordinates -2,656, 62, 616
3. Observe the coastline. Another example is found further south.