Villagers can plant torchflower crops and pitcher crops but cannot harvest them once they've fully grown

Summary
Despite being able to pick up seeds, plant, and bonemeal Torchflowers and Pitcher Crops, villagers do not harvest them. This is inconsistent with other villager behaviour, and leads them to occupy all farmland with crops they cannot replace.

Expected Results

Villagers should to harvest the crop once fully grown in order to replant, as with any other crop that they plant.

Actual Results

The Villagers fill up all available farmland, but never harvest, rendering the farmland unusable.