Stairs and slabs above water create hacked water even though they aren't in water
What I expected to happen was...:
Stairs and slabs to be above the water without interacting with the water in any way
What actually happened was...:
Stairs and slabs have hacked water in them which causes weird rendering
Steps to Reproduce:
1. Put slabs and stairs in the block above water sources
Related to MC-125216
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I do think that fixing MC-125216 would also fix the problem you're having. It looks like it's the same issue even though slabs are placed above water in this case.