The Bug:

Any blocks including indestructible blocks can be destroyed near the end crystal when you resummon the ender dragon.

How to Reproduce:

1. Go to the end and kill the ender dragon
2. Place any blocks next to the end crystals
3. Resummon the ender dragon by placing 4 end crystals in the center
4. When the ender dragon is being resummoned, the end crystals will make explosions sounds and destroy any block in the game.