[MC-128109] Why bubbles do not appear when there is nothing above them

Why do not bubbles appear when there is nothing above them, but if I remove the block from the block then they appear it is not a bug?

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violine1101 2018-04-07T13:50:30Z

Working as intended (for now), see @unknown's comment in MC-125400:

I made a fix that should be consistent. However, this will probably change when we have the real water fixes in. Current bubble column rules (might change!):
No horizontal neighbor is allowed to be air
At least one horizontal neighbor must be a pure WATER block
This can give ugly looking things i.e. when placing bubble columns in water falls. This is planned to be fixed with the other water fixes.