While trading with farmers you eat food in your hand

Put the summary of the bug you're having here

What I expected to happen was...:
The UI for the farmer villager opening, without eating

What actually happened was...:
The UI for the farmer villager opening, and I ate the food in my hand

Steps to Reproduce:
1. Have at least half a bar of hunger unfilled
2. Have food in your hand/offhand
3. Open UI with a farmer villager