It appears Bastion Remnants can cause sharp cuts in the world generation:
Seed: 5904889398651882482
/execute in minecraft:the_nether run tp @s 19.85 64.01 300.57 -311.71 58.80
Status:Won't Fix
Reporter:Marcono1234
Assignee:[Mojang] Cory Scheviak
Created:2020-04-17, 05:06 PM
Updated:2020-06-26, 02:55 PM
Resolved:2020-05-15, 10:23 AM
Votes:3
Watchers:1
Confirmation Status:Community Consensus
Mojang Priority:Important
Category:World generation
Labels:
Affects Versions:20w16a, 20w17a
Fix Versions:-
MC-179172
MC-179172MC-179172