I was trying to raid a obsidian vault. When I fired my cannon to hit the obsidian wall, no damage was dealt to the wall. There was no water protecting the obsidian. I fired more then six shots to see if it was just a bug with checking the damage but the obsidian didnt break. I went to a random tp and tried stacking 20 tnt to see if the 20 would damage the obsidian and nothing happened. Other players have done damage to the obsidian I just cant. We could damage the wall a few days ago just today seems to be a problem. Thanks for any input.