Chests that generate in Ocean ruins are not waterlogged. It looks like it's waterlogged only from above but not from the sides. But it's actually not waterlogged, since it fixes if you put water on it.
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Josh74000MC
migrated
This is not a duplicate of MC-125351. If you waterlog a chest it doesnt show any air in it.
Probably something to do with the new way terrain generates with the new biome names.