The water and soul sand for my nether wart farm is behaving improperly.
When I use a dispenser and a bucket of water to flood my nether wart field for harvest, the field floods as expected, pushing items to the water trough at the end to be carried away for collection.
However, when the dispenser tries to retract the water, the source block disappears, but the water level in the field rises. I can only get rid of the water by manually blocking out the four corners where the water is at highest level.
Below is a sequence of photos showing the progression. The first is the empty field. The second is the field flooded by the dispense as normal. The third is the field "flooded" after the dispenser has retracted the water.
I have the exact same set up for other fields for other crops. Only the nether wart farm has this problem. I assume it is an issue of the water interacting with the soul sand under the new bubble column physics. If you look in the last picture, you can see an upward bubble column has formed where none previously existed. All four corners will exhibit this behavior.
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The dispenser was activating twice on the second press of the button, you can hear the 'click' sound twice and the water was dispensed twice. Does this happen when the dispenser is activated once?
There is a second field (a dirt field) out of frame for another farm on the same circuit. Its dispenser would be the source of the second click in the audio. That field floods and retracts properly.
I've taken the second field of the circuit and recorded a new video. Only one click is audible. The results remain the same.
Confirmed in W10 1.6.0.6. I believe this is due to the bubble columns made by soul sand. They turn to bubble columns but don't become source blocks but act like a source which stops the flowing water from disappearing.
Due to the way water behaves with the bubble columns, this is how water can behave when flowing over soul sand. For that reason this will need to be closed as a duplicate of MCPE-35444.
However, you might be able to work around the issue by changing the position of the dispensers slightly, as shown here:
[media]
In this setup, you should be able to dispense water without it creating source blocks in unwanted places.
Could you provide a video?