When you create a double stone slab block of each type (stone, bricks, nether bricks, etc), it automatically transforms into a double stone slab block. with the F3 menu, we can also see that there is a Round Trip Different problem, with different A/E problem in each kind of slabs.
Double Slab blocks already generated (in 14w11b for example) also transform by this way.
Wooden Slab aren't affected by this bug.
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Duplicate of MC-53370 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
duplicate of MC-53374