Minecolonies version
MC 1.15/Minecolonies 0.10.766/ Structurize 0.10.281

The guy that harvests the plants that grow on the fertilised dirt harvests them by stepping on the block the flower has grown in and breakes it ("harvests"). All good until you get to the modded flowers such as the Burning blossom from the Biomes o'plenty. That one sets the villager on fire and he/she dies. Because the fact you can only select what to grow at lvl 4 all the other levels of the building are useless in this case. To balance this issue I'd suggest making the harvest range 1 or 2 blocks away from the target or blacklist that flower so it doesn't randomly grow and kill the villager.