Steps to Repoduce:
Make a 3x3 square of buttons with no button in the middle.
Add blocks above the 8 buttons.
Put water in the middle of the 8 blocks.
Add 1 slab in the top block’s bottom half and add 1 slab in the bottom block’s bottom half.
Remove the slab in the bottom block’s bottom half, then remove the slab in the bottom block’s bottom half.
Expected Result:
The water should flow down into the block below.
Actual Result:
The water floats and does not flow into the block below.
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This issue is being tracked at MCPE-34237.