Water Doesn't Flow Correctly Near Fences, Etc.

I heard water can flow out of waterloggable blocks but not flow in to them.
Possible WAI.

Oh, it totally makes sense that water can't flow into those blocks, but in the depicted situation the water SHOULD flow away through the opening. Placing a fully solid block instead of a fence causes that behavior, and if "water-capable" blocks can't be flowed into and treated as solid...

Minecraft doesn't have that coded in yet. That's why it doesn't work.

Michael, notice the screenshot. The water isn't flowing out the empty space, where it should flow even if the fences were solid blocks. And on that note, I cannot reproduce this.

Oh, my bad. I was able to reproduce this; Make a 3x3 square with fences, with 1 block air inside, then place the water bucket, breaking one of the fences afterwards.
It seems kinda random when it happens or not. It isn't random. You have to wait about 2 seconds after placing the water and then remove one of the fences.

Tryashtar: note that you need a place where water wants to "naturally flow downhill," ie, an air block no more than 5 blocks away and 1 down:

Torches being the stand-in for Fences/slabs/etc and the Lapis being where the water is.

Michael: no breaking of fences required. I'm talking about dropping a bucket down and expecting it to flow one way and having it not flow at all.

Agree, when tested on a 8x8 flat surface water behaved normally.

Ah, I can reproduce when there's a hole somewhere on a side except for directly in front of the opening. Thank you

Bingo

Ah ha, there was a duplicate. I tried to find it, but it eluded me.