In the 1.18 packet, when y = 0 or less, magma blocks will be generated.
This is very likely working as intended.
Source from the 21w06a article:
Magma sometimes generates at the bottom of underground bodies of water.
Reporter: fjginr
Assignee: (Unassigned)
Created: 2021-06-05T10:49:02Z
Updated: 2025-03-09T22:49:10Z
Resolved: 2021-06-05T11:19:33Z
ADO:
Confirmation Status: Unconfirmed
Area:
Mojang Priority:
Category: (Unassigned)
Labels:
Affects Versions: 1.17 Release Candidate 1
Fix Versions:
Retrieved 2025-06-09T20:03:21Z
This is very likely working as intended.
Source from the 21w06a article: