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.
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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.

Affects 1.16.200.56 Beta

this affects the bottom/backs of stairs, and also beds as well.

Affects 1.17.11

Affects 1.17.40.20

Affects 1.19.22

Affects 1.19.30

Confirmed in 1.21.44