I am having a similar issue trying to use the minecraft:redstone_conductivity component in block permutations by a custom state.
I have attached a small addon that demonstrates the issue.
In the picture, the custom block is lit and should also be conducting redstone.
[media][media]
I've provided a sample addon that contains an entity utilblocks:droidfarmdriver which attempts to use the behaviour work.composter.
You will need to set up a wheat farm with a composter near it, spawn the entity and give it several stacks of wheat seeds. It should work the farm and use the composter but it does not.