Issue Description:

This is, perhaps, not really an issue but working as designed. I thought I would document it here for others to reference.

When you first place down a Henhouse amidst free-ranging chickens and add one or more Hay Bales to the upper left inventory slot...nothing happens. Eligible drops are not collected and the central measure does not fill with Hay. Eligible drops are those of non-Vanilla chickens and drops not generated by the Hatchery mod. So for a Bone Meal Chicken the Henhouse should collect Bone Meal.

When the next eligible drop occurs, then that drop (Bone Meal for instance) is collected and the central Hay meter registers an amount of Hay. Previously dropped (prior to the placement of the Henhouse) eligible drops are still NOT collected.

Using a Henhouse with the Hatchery mod installed is probably non-optimal as the Hatchery mod provides an alternative mechanic that renders the Henhouse obsolete and inefficient.

Steps to reproduce (important):

1. Chickens Mod for Minecraft 1.12 (also Hatchery installed)
2. Place Henhouse
3. Use Henhouse and observe state in the UI
   ...

What happens:

If you wait for the next eligible drop then the Henhouse will begin to function as expected