When you use /summon FallingSand ~ ~ ~ {Block:stone_slab,Data:3} to summon a cobblestone slab and it collides with an other type of slab, it changes the solid slab's data value to the summoned ones.
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Make a fast setblock clock by doing the following:
1. Make a command block with this command in it: /setblock ~ ~-1 ~ redstone_block
2. Put another command block two blocks below the first one and put this command in it: /setblock ~ ~1 ~ air
3. Put a redstone block in the middle. This created a fast clock.
Then do the following:
1. Put a command block with this command next to the redstone block: /execute @p ~ ~ ~ summon FallingSand ~ ~ ~ {Block:stone_slab}
This will spawn a falling sand entity with the block id of a stone slab rapidly to you.
2. Now walk on top of other type of half slabs and notice that they turn into stone slabs.
I hope this cleared things up.
Confirmed with the 0.5 tick clock, please update the description with what you just commented. Also affects wood slabs when summoning those with the clock, but wood slabs and the other slabs don't interfere with each other, probably because they have a different id.
Cannot confirm with the command given, and neither when adding Time:1