I was trying to invoke the wither to get xp (typical), so that the world is not destroyed and that it is easier to kill it, I made a quarter of obsidian, when I invoked it, it surprisingly broke the obsidian and killed me since it did not I had armor on
What happened was, that he broke the obsidian with his projectiles (I mean projectiles the heads he throws ... the bluish head broke the obsidian)
What must have happened is that he didn't break the obsidian with anything ...
Steps to reproduce
1- have some entity near obsidian blocks
2- invoke a wither near that entity
3- make the wither shoot the entity while it is close to the obsidian