When Ocean Monuments generate in 1.18 Release Candidate 3, they delete surrounding terrain in a cube around them.
What I expected to happen was...:
Ocean Monuments would generate integrated in the terrain
What actually happened was...:
Ocean Monument generation overwrites terrain generation and forms weird borders
Steps to Reproduce:
1. Open a 1.18 Release Candidate 3 World
2. do /locate monument
3. teleport/travel to the monument to see the generation bug
Linked issues
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Duplicate of MC-237145.