Cave world generation does not generate correctly. There is only lava below the ceiling, unlike it was before.
MC-184641
Cave world generation does generate only lava under the ceiling if using an ocean biome
Resolved
Fixed
0
W_V
(Unassigned)
Confirmed
(Unassigned)
20w21a, 20w22a, 1.16 Pre-release 2, 1.16 Pre-release 3
1.16 Pre-release 4
Retrieved
Actually this has been fixed in -pre4 most likely along with MC-184644.