Steps to reproduce:
Place a stair or slab on the air;
Cover its sides;
Waterlog it;
Break the block.
Expected results:
The water flows from the bottom.
Observed results:
The water stays the same way it was.
Linked issues
is duplicated by 24
MCPE-191395
Water source block not updating after waterlogged block was removed from its place:
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MCPE-189442
Breaking a waterlogged block midair causes the water to not flow downwards.
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MCPE-182853
Water in waterlogged stair does not flow if stair is removed
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MCPE-178832
Floating water using slabs
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MCPE-177567
A floating water WITH A CARPET
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19 more links
I have the same issue on both Xbox One and Windows 10. Screenshots are from Windows 10. v.1.6.1 for Windows 10.
Steps to recreate (a little more clearly)
1) Place a stair block two blocks in the air.
2) Surround the three open sides of the stair block with glass (to see what's going on). Leave the full back and bottom of the stair block open to the air.
3) Use a water bucket to waterlog the stair block. No water should be flowing at this point (as intended).
4) Ensure no blocks are immediately below the stair block.
5) Break the stair block.
6) Observe that the water behaves as if it were still contained within a stair block. It does not flow downward or out the back.
See screenshots showing stair block surrounded by glass for visual example.