The bug
Water sources will fail to generate on the south side of flooded caves and ravines. This causes flowing water to generate in the places without water sources, and it can be annoying to swim around when the flowing water pushes on you when trying to explore the caves.
How to reproduce
Use the seed 7828475263820063647 in the ocean buffet world generation, /teleport 27 23 -28
, and go to spectator mode for a better view of the bug. They're everywhere.
Related issues
is duplicated by
relates to
Attachments
Comments

Related to MC-126066
An important note is that this bug existed before MC-128690, so it was less observable at that time because the water can flow sideways. This means that if MC-128690 gets fixed, the air pockets would be gone but the flowing water that fills them would still exist. If this gets truly fixed, it would get rid of the ugly flowing water "pockets" and make exploring the caves less weird.
Editing since MC-128690 was fixed.
Can confirm that this is fixed. The flooded caves and ravines now generate completely and properly filled with water.