So as i know soulsand and magma blocks must make boats sink well it doesnot it just makes them jump madly LIKE CRAZY but magma blocks do make them sink
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If you swim into a bubble column at the surface of the body of water, it will launch the player into the air, rather than cause them to bob up and down. Eventually you end up practically standing on the surface of the water, rather than being submerged as expected.
Duplicate of MC-125272 (which has been marked as WAI)
Though it isn't as drastic as that, entities like the player also get launched too much when at the surface.