Water that is placed onto the back face of a stair block (of any kind) will waterlog the block, causing the water to stream out the front.
To recreate the issue, place water from a bucket on the back face of a stair block.
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Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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And where’s the issue? That’s how it’s supposed to be and if you want to place water down while facing a stair then shift+click.