Tiles 0-3 are the ones not working right now. Only the default reeds png is shown which is in /textures/blocks.
Tiles 4-7 are the yellow reeds. And they work, as you can see in the picture.
This is how tiles 0-3 look like working alone.tiles=0-3
method=vertical
biomes=Swampland
tiles=4-7
method=vertical
biomes=Plains Jungle JungleHills