Updated from EVGENSYPERPRO
Summary:
When you enable the "Caves and Cliffs" and "Education Edition" features, a broken item with no name or description appears in the "Nature" tab. It has a broken texture.

Steps to Reproduce:

1. Enable "Caves and Cliffs" and "Education Edition" in the world settings.
2. Enter the world.
3. Open your inventory in the "Nature" tab.

Observed Results:
A "broken item" will appear in your inventory.

Expected Results:
It shouldn't be in your inventory.

Notes:
Does not work only with "Caves and Cliffs" enabled / only with "Education Edition" enabled.

Image: