"Tile" tag on falling sand spawners doesn't work anymore

In 1.4.7, I had created several spawners that spawn Falling sand entities, with different "tile" tags to make different blocks appear. When I updated to 1.5, the spawners still spawned correctly, but it created regular sand blocks rather than the blocks it was supposed to. When I went into the nbt, the tile tag was still there but wasn't working.
Does the tile tag no longer work because of a bug, or because it was renamed to something else?