This bug is new. This is not the known "10 years old" bug. (THIS IS NOT THE MC-92 BUG!) I cant find a report for this. Look at the screenshot 1 - 14w11b - Left = half slabs, right = full block
screenshot 2 - same but 1.7.5
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Are the slabs above ground?

No, they are flush. One level.

I use half slabs in order to save material.

Me too the same problem