Summary
The ender dragon tries to destroy the bedrock portal in the end and gets stuck into it.

what it normally does
Normally, it destroys all user build structures.

What happened:
the empty bedrock portal that was generated the first time I entered the end was attacked by the dragon. each time it reaches the structure, it gets stuck into the pillar for a certain amount of time.

Steps to Reproduce:
1. go to the end
2. track down the empty structure surrounded by pillars
3. wait