[1.8] Having issue setting variant of block via Config

I am adding the ability to change what biomes villages can spawn in and what blocks they are made out of. Everything is configurable and works fine except when the player replaces a block with a variant of itself.

To replace a block in village generation, you write:

~original_block_name,replacement_block_name:metadata,target_biome

where:

- original_block_name and replacement_block_name are the unlocalized names of the original and the replacement blocks,

- metadata is an integer in the range of 0 to 15 and the data value the replacement block should have,

- target_biome, is 'b:BiomeName'

Config:

https://gist.github.com/LogicTechCorp/32db8a23c419067e7d66

Config Handler:

https://github.com/LogicTechCorp/FloraSoma/blob/master/src/main/java/florasoma/common/ConfigVillage.java#L111

Block Replacer:

https://github.com/LogicTechCorp/FloraSoma/blob/master/src/main/java/florasoma/util/BiomeBlockReplacer.java#L31

Clarification: It works if you set a different block with metadata but it does not work if you set the same block with a different metadata.