What I expected to happen was...:
When using command
/summon FallingSand ~ ~3 ~ {Block:minecraft:log,Data:4}the block 3 blocks above the command block should turn into a log facing east/west and wall and land on the command block.
What actually happened was...:
When command previously stated is used the block turns into a log facing up/down until it hits the ground and then faces east/west once the block has actually been placed.
Steps to Reproduce:
1. Place a command block with the command stated previously
2. Place a log with any data value 3 blocks above the command block
3. Use any kind of redstone to activate the command block
Edit/Note
I went back and tested this in 1.7,2 (because I was almost 100% sure that the fallingsand logs were behaving properly in that version) using the command:
/summon FallingSand ~ ~3.5 ~ {TileID:17,Data:4}
and something similar yet different occurred. The logs themselves oriented correctly but the bark was still orientated vertically. I'm not sure if this information is helpful but I thought I would add it.
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When you place a log it reorients itself. Try giving yourself that log and placing it by hand. Same result. There's a few other "alternate damage value" blocks that can't be placed without reverting (giant mushroom block always becomes the "inside on all 6 sides" texture that looks like a band aid).
Now if you use setblock instead it will place it correctly. But then you don't get the cool "airdropped from space" effect.
Still the case in 1.8. Please update affected version!
Another example:
/summon FallingSand {Block:"minecraft:water",Time:1}
Broken resource pack? Please switch to the default resource pack, and see if it occurs there.