Placing sponge on the seabed causes an air pocket. but instead of filling back with water like normal, the air pocket stays there permenently.
MC-126587
sponge creating permenent air pocket in ocean
Resolved
Duplicate
0
DuplexEagle
(Unassigned)
Unconfirmed
Minecraft 18w09a
Retrieved
Possibly related to MC-122171, maybe even same issue.