I planted a carrot seedon soil block, but could not plant an analysed carrot seed.

This aplies to other seeds

This is intended behaviour. If I'd allow this, the data on the seed would be lost. You can still plant them on crops though.

https://github.com/InfinityRaider/AgriCraft/blob/master/src/main/java/com/InfinityRaider/AgriCraft/handler/PlayerInteractEventHandler.java#L34-L39