Superflat customization "hidden" blockstates show as Air

When using blockstates that are not supposed to be held by the player the block just shows as air in the customisation menu, for example:
When using "3;minecraft:bedrock,2*minecraft:stone:2,minecraft:grass;1" everything works fine and Polished Granite is shown and named properly, however, when using: "3;minecraft:bedrock,minecraft:water,minecraft:farmland,minecraft:wheat:7;1;" wheat is named air and displayed as an air block (actual world generation works fine however).