there is a sheild in my off hand, and in my main hand, there is a food item. When i right-click, the sheild blocks, but the food goes down, then up. It works best in creative mode.
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The shield is visible in the second screenshot.
#SunCat Look at the hotbar. there is a shield in the offhand place.
Can't confirm, but you have another bug - you don't have a shield in your off hand (though you have it in your off slot)