After update 1.7.0 (February 11th), we've changed how our Harvesting works.
While before our Villagers (who are living their well deserved retirement) used to do it for us automatically, now we've changed into:
MANUAL HARVESTING
Harvesting can now be done by directly tapping on the Harvester you want, giving you total freedom over which resources you want to collect at any given moment.
Each tap will drop a resource onto the nearby grid, consuming Energy.
If you want a lot of drops from a single harvester, you can also tap and hold to rapidly harvest the resources you want.
Also important to note that Energy cost and resources increase with Castle level (e.g. Castle level 4 = 4 Energy spent per harvest → 4 resources received).

Now go harvest with total control and freedom over your resources, Lightkeeper 🧙