Even in the ocean if you but a magma or soul sand block in the water in a 1*1 space, the bubble column will disappear and will not reappear, even when the blocks on the side are removed.
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duplicates 1
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I noticed this as well, in several YouTube videos they showcase bubble elevators and all use a 3x3 design, with only the middle block being the Magma or Soulsand block to produce the desired effect.
In recent versions, however, a 1 block won't do it. You can get it to work with 2x1, but even then only 1 block is producing the effect, the other is just piggy backing off it.
Oddly enough if you 3x3 the entire area, it checkerboards with the effect to some degree, seeming to take away a previous effect to add the new.
also - if you make water flow off from the block to a side, and downward, some bubbles appear in the 1 block middle. (but not the desired high volume of bubbles to push things up quickly or drag down )
Invalid. Please give a clearer description next time.