Sponge blocks will remove water 6 blocks away from it in the North direction, but only 5 blocks away in the other three directions.
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I tried this. It removed 6 on the east side and 5 on the others. I then tried again, it removed 6 on east and west, then 5 on north and south. It could be random?
I'm having similar problems, it seems to be due to a cap in how much a sponge can absorb, on my world it seemed the sponge didnt absorb in the west direction.
https://bugs.mojang.com/browse/MC-57525
my bug report is noted as working as intended while you can actually count water blocks and come to the conclusion it does not work as intended.
i bet the absorbing code is just not yet bug/random free. i think most people would agree that it should be less random since 64 blocks wont cause a sphere to form. (not to mention i found out it actually doesn't cap to 64 on my worlds)
As you can see, the sponge is directly in the middle of the water blocks. You can try this for yourself.