In the "items" section at the very bottom there is a "broken block" that has no name and is not displayed in the hand. He has a few pixels texture in his inventory!
Steps to Reproduce:
- Create new world with toggle Caves and Cliffs ON.
- Switch to creative game mode.
- Go to the "items" / "all" tab
- Move on to the very last item.
- Take it.
You will find an unknown item (empty or broken).
This item should not be in minecraft.
When you enable "Education Edition", the item is in the nature tab.
Education Edition OFF
Education Edition ON