Gravity blocks can be duplicated using derailed minecarts and chunk reloading
Steps to reproduce:
- Import and open the attached world: Gravity Block Dupe.mcworld

- Destroy any dragon eggs next to the derailed minecart
- Either go through the nether portal to the Nether and back to the Overworld, or exit and re-enter the world
Observed result:
The dragon egg (gravity block) is duplicated.
Expected result:
The dragon egg (gravity block) is not duplicated.