After importing our world from the previous Xbox One Edition save, my wife and I cannot eat food unless:

1. Our hunger drops to 3 full points (point where you are not allowed to sprint anymore)
2. The food item is a golden apple

Upon eating food at the 3 full points level, we cannot eat anymore, even if the food item eaten does not replenish our hunger bar completely. For example, our hunger drops to 3 full points, we eat a carrot, our hunger is replenished to ~5 full points as expected, but we are now unable to continue eating until our hunger drops back to 3.

To reiterate, golden apples are the only item that can be eaten at any time. Golden carrots and glistering watermelons do not work at this point either. For some reason golden apples appear to be considered completely different from every other food source in this situation.

We do not experience this issue in other worlds that are initially created in this new Minecraft version.