I found that if kelp gets ejected from one water stream to another it will not flow up even if you make a soul sand water stream. It just sit on the bottom
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Correct, for a bubble column to work, it needs to have only source blocks above it without any waterlogged blocks or air.
so you don't even see the second soul sand stream in the pic? and the kelp in the bottom with the bubbles?
I misunderstood the issue, sorry - this is a duplicate of MC-150417, which will be fixed in 1.16.2.
I dont think this is a bug. The kelp blocks prevent the buble callem from forming and the pistons brake the water sorce making it down words flowing water.