Minecraft Username:blackbelt4eva
Brief Description: If you had an existing trade sign with iron chest plates, and the 3rd line says "ironplate" They have converted into iron pressure plates.
Instructions: Go to a sign that had iron chest plates, then buy.
How many times did you recreate this bug?:1
Result: Instead of the iron chest plate appearing in your inventory, you get an iron chest plate
Expected Result: Get an iron chest plate Evidence:

Spoiler

 

I dont know why is does that with the spoilers, the first one.