In this case, the source blocks are only present at the top of the hole, meaning that there's nothing below to create additional source blocks. The upper layer is not trying to fill the center because the existing water paths are treated as drops in elevation, therefore they won't try to take the new path. Placing a block under one of the central source blocks should cause it to fill the center.
In this case, the source blocks are only present at the top of the hole, meaning that there's nothing below to create additional source blocks. The upper layer is not trying to fill the center because the existing water paths are treated as drops in elevation, therefore they won't try to take the new path. Placing a block under one of the central source blocks should cause it to fill the center.
My Verdict: Works as Intended.