Starting to eat when going into trading UI

The bug

When clicking on a villager to open their trading UI while holding a food item in hand (And a not filled hungerbar), Will eat the food in the background while in the trading UI.

 

How to reproduce

1. Hold any food item in your hand, also make sure you don't have a filled hungerbar
2. Right click onto a villager with a profession to open it's trading UI
   →  You start to eat in the background while in the trading UI