Placed a Phantom Placer on the ground, toggled redstone mode to 'pulse,' placed a block in it and supplied it with a redstone signal. Server crashes, restarts and the block is still in the Placer. Tested with Stone and a Crystal (ones used for spawning the Ender Dragon) in a cardinal direction and Up.

Crash log: http://pastebin.com/SYCit9Ga

Report is from ActuallyAdditions-1.10.2-r56.jar, tested in ActuallyAdditions-1.10.2-r60.jar and it is still present.