Farmer Villagers recognize fully-grown Lettuce, Tomato, Cucumber and Onion crops and harvest them, but they do not pick up the seeds to replant, nor do they pick up the produce (Lettuce, Tomato, Cucumber or Onion items). One would expect them to either pick up the seeds to replant and the produce items to give to other Villagers, or to ignore them entirely.
Tested in 1.16.1.
Villagers are programmed to break any type of CropBlock, but the list of things they can pick up is hardcoded. I should be able to fix this somehow, though.
Farmer Villagers recognize fully-grown Lettuce, Tomato, Cucumber and Onion crops and harvest them, but they do not pick up the seeds to replant, nor do they pick up the produce (Lettuce, Tomato, Cucumber or Onion items). One would expect them to either pick up the seeds to replant and the produce items to give to other Villagers, or to ignore them entirely. Tested in 1.16.1.